Makes we repair
Is Johnson & Starley still in business?
Johnson & Starley is still in business, but it sells no boilers today. The company, founded in 1922, makes warm air heaters and air filtration now. It keeps its boiler manuals in an archive, which it describes as information on past and discontinued products.
Johnson & Starley's boilers were the Reno, from about 2004, and the QuanTec, from 2012, which it still listed in June 2024. The company says it does no servicing, repair or installation work itself, and its spares page names its warm air heaters, not its boilers.
We fit new boilers in place of a Reno or a QuanTec, quoted from photos or after a free survey visit. We are an independent firm, with no connection with Johnson & Starley. If yours has stopped, ring us, and we'll ask what the display shows.
Sources: Companies House, Johnson & Starley's pages on its history, products, document archive, FAQs and spares, and its archived product pages.
What's involved in replacing a Johnson & Starley?
Replacing a Johnson & Starley boiler starts with a quote. We quote from photos of the old boiler, its flue and where it sits, or after a free survey visit. The quote is in writing before any work starts. A quote made from photos is confirmed at a survey before the new boiler is fitted.
Still under guarantee? A QuanTec was sold with an 8-year parts and labour guarantee, and was still listed in 2024. One fitted in recent years may still be covered. Your guarantee letter gives its dates and terms.
The flue and the type: every Reno and QuanTec is a room-sealed condensing boiler. That means neither its flue nor its type is the hurdle an older, open-flued boiler can be. A Reno or QuanTec system or regular boiler heats a hot water cylinder. We'll ask whether you'd keep the cylinder or change to a combi. See how combi, system and regular boilers differ.
Sized to your home: our engineers size the new boiler with a heat loss calculation, and set its heating output to suit the home. They balance the radiators fully when it goes in.
What the rules ask of a new boiler in England:
- A new gas boiler must meet a minimum efficiency, its ErP rating.
- A new combi needs one more energy saver, such as weather compensation or a smart thermostat that learns and adjusts.
- The heating is cleaned and flushed, with inhibitor added.
- A carbon monoxide alarm goes in the same room.
The makes we fit most are Vaillant and Worcester Bosch, and we fit every make and model. The maker's own magnetic filter goes in where its guarantee asks for one. Nothing is fitted without your yes.
Need heat back sooner? We fit emergency replacements. Ring us, and we'll ask what the boiler is doing and say when an engineer can come.
Sources: Johnson & Starley's archived QuanTec pages, and Approved Documents L and J.
15% off a new boiler, fitted
The 15% comes off the price of a new boiler installation. We quote from photos of your old boiler, or after a free survey visit. Now is the time to replace an old or discontinued boiler.
Terms: 15% off everything in the price we quote for a new boiler installation. That means the boiler, its flue and controls, and the fitting. The offer is for installations booked by 31 December 2026. One offer per home, and not with any other offer.
Which Johnson & Starley boiler do you have?
Johnson & Starley made two ranges of wall-hung gas boiler, the Reno and the QuanTec, all of them condensing. The way each shows a fault tells them apart:
Reno HE combi
Models
HE30C and HE37C, and the LPG HE30CP and HE37CP
Type
Condensing combi
Faults show as
E and a number on a small display, such as ER:26
Reno HE system
Models
HE16S, HE25S and HE31S, and their LPG models
Type
Condensing system boiler
Faults show as
E and a number on the display
Reno HE regular
Models
HE16H, HE25H and HE31H, and their LPG models
Type
Condensing regular boiler, for the radiators and a cylinder
Faults show as
A pattern on six LEDs (the first, of 2004)
RenoXtra
Models
HE30CXtra and HE37CXtra
Type
Combi with a gas saver module for the hot water
Faults show as
No manual could be found, so ring us
QuanTec
Models
The 24c, 28c and HR28C combis, the 24s system boiler, and the 16r and 24r regular boilers. Later came the HR28C, 30C, 30C-SA and 24C ErP
Type
Condensing combi, system or regular boiler
Faults show as
E and F codes on a display
A Johnson & Starley warm air heater isn't a boiler. Warm air heating has been the company's main business for a century. An appliance of theirs that isn't a Reno or a QuanTec may well be a warm air heater. The codes on this page aren't a heater's codes.
Not sure which you have? Ring us, and we'll ask what it is called and what it does. Not a Johnson & Starley? See every make, current and discontinued, by type.
Sources: Johnson & Starley's user instructions and installation manuals for the Reno and the QuanTec, its archived product pages and its history page.
Reno and QuanTec codes, and what they mean
A Johnson & Starley boiler shows a fault as a code, and the Reno's codes differ from the QuanTec's:
- A Reno combi or system shows E and a number on its display, such as ER:26.
- The first Reno regular boiler shows a pattern on six LEDs.
- A QuanTec shows E and F codes.
Some numbers mean the same on both, such as E37 and F37, low pressure. Others don't, such as E33, a hot water sensor on a Reno and the return sensor on a QuanTec. That's why each code here is named with its range.
The first five panels below are the faults the user guides explain. The last three hold every code.
Low pressure on a Reno or QuanTec: E37 and F37
What it means: Low pressure means the sealed heating system has lost water pressure. The signs differ by range:
- On a Reno, the pressure figure flashes below 1.0 bar. At 0.6 bar, E37 shows and the heating and hot water stop.
- A QuanTec won't run below 0.3 bar, and shows F37.
Possible causes on a Reno, as the manuals list them: the pressure itself, then the pressure sensor.
Possible causes on a QuanTec: a system not full or valves closed, then the pressure sensor's connections, then the sensor.
What you can do: on a QuanTec, top up as its guide shows. The steps are below. A Reno's guides say a competent person tops it up, after looking for a leak, so ring us.
If the pressure keeps dropping, ring us. Johnson & Starley says a QuanTec that keeps losing pressure between its yearly services has a leak on the system.
A Reno or QuanTec failed to light: E1, E26 and E01
What it means: A failure to light means the boiler couldn't prove a flame. What you'll see depends on the range:
- E1 on a Reno: the boiler failed to light after several tries.
- E26 on a Reno: the boiler lost its flame five times in four minutes.
- E01 on a QuanTec: the boiler failed to light after five tries.
- The first Reno regular boiler: LED 1 alone, or LEDs 2, 4 and 5.
Possible causes of a Reno's E1, as the manuals list them:
- the gas supply and gas cock
- the flame sensor and its wiring
- then the gas valve
Possible causes of a Reno's E26:
- the flame sensing
- falling gas pressure
- the fan
- a blocked flue
Possible causes of a QuanTec's E01:
- the gas pressure
- the detection electrode
- a blocked condensate pipe
- the gas valve
- then the board
What you can do: see that your other gas appliances work, then reset once, as each range's reset sets out.
If it comes back, ring us. If you smell gas, don't reset anything. Ring the National Gas Emergency Service on 0800 111 999.
A Reno or QuanTec overheated: E3 and E03
What it means: An overheat means the water in the boiler got too hot. It shows as E3 on a Reno, E03 on a QuanTec, and LEDs 1 and 2 on the first Reno regular boiler.
Possible causes on a Reno, as the manuals list them:
- air in the boiler, or no water
- then the bypass, the flow sensor's clip, the pump and the secondary heat exchanger
Possible causes on a QuanTec:
- a system not full, or valves closed
- then the flow and return difference, the pump and the sensors
What you can do: on a Reno, press Reset once. On a QuanTec, its guide gives these steps:
- Top up to 1.0 bar.
- Bleed the radiators.
- See that the radiator valves are open.
- Then reset.
A Reno or QuanTec stopped by its condensate pipe, blocked or frozen
What it means: A blocked condensate pipe stops a Reno or a QuanTec. Every one is a condensing boiler, with a plastic pipe that drains its water. When debris or ice blocks that pipe, a Reno locks out and a QuanTec shuts down. A blocked pipe has no code of its own, though the QuanTec's checks for E01 include it.
What you can do: Johnson & Starley says to pour warm, never boiling, water from a kettle over the frozen part. Do that where the pipe is within reach outside, then reset. Never alter or block the drain.
If that doesn't clear it, ring us.
The heating or the hot water has stopped on a Reno or QuanTec
What the manuals check: A Reno or QuanTec can stop heating, or giving hot water, with no code showing. The first check is for a call from the timer, the thermostats and the boiler's own controls. On a Reno combi with no hot water, the water flow, the cold inlet filter and the flow sensor come next.
What you can do: see that the timer and thermostats are on and calling. On a QuanTec with no heating, its guide says to press and hold its two hot water buttons for 5 seconds, until the symbol goes.
If that doesn't bring it back, ring us.
MoreEvery code on the Reno combi and system
A Reno combi or system shows E and a number, such as ER:26 on its display, and keeps the last eight codes in its memory. The system boiler has no E32 or E33, its hot water sensor codes.
E1Failed to light after several tries
What the manual's checks are
The gas supply and gas cock, then the flame sensor and its wiring, then the gas valve
E2False flame: a flame sensed while the burner should be off
What the manual's checks are
The ignition control board's wiring
E3The water got too hot
What the manual's checks are
Air in the boiler or no water. Then the bypass, the flow sensor's clip, the pump and the secondary heat exchanger
E5No fan speed signal
What the manual's checks are
The fan and its wiring
E7The flue gas is too hot (a blocking fault)
What the manual's checks are
Reduced water flow: the insulation behind the heat exchanger, the water, the pump
E8A flame circuit fault
What the manual's checks are
The flame sensing lead, shorted to earth
E9A gas valve circuit fault
What the manual's checks are
The control board's seating on the valve, then the board or the valve
E11The flow and return sensors disagree
What the manual's checks are
A bypass, and the sensors' fitting
E12A memory fault
What the manual's checks are
The control board
E13Too many restart attempts
What the manual's checks are
The control board
E21An internal error
What the manual's checks are
The control board
E25A software check fault (a blocking fault)
What the manual's checks are
The software versions
E26The flame was lost five times in four minutes
What the manual's checks are
The flame sensing, falling gas pressure, the fan, a blocked flue
E30The flow sensor has shorted (a blocking fault)
What the manual's checks are
Its wiring and resistance
E31Listed twice: the heating flow sensor out of range, and the flow sensor's circuit open (a blocking fault)
What the manual's checks are
Its wiring and continuity
E32The hot water sensor has shorted (combi)
What the manual's checks are
Its wiring and resistance
E33The hot water sensor's circuit is open (combi)
What the manual's checks are
Its wiring and continuity
E34Low mains voltage
What the manual's checks are
The incoming supply
E37Low water pressure
What the manual's checks are
The gauge, then the pressure sensor and its wiring, then re-pressurising
E40The water pressure is too high
What the manual's checks are
The pressure when cold and the expansion vessel's charge, then the sensor
E41No pressure signal
What the manual's checks are
The wiring
E44The heating return sensor is out of range
What the manual's checks are
Its wiring and continuity
E45The flue sensor has shorted
What the manual's checks are
Its wiring and resistance
E46The flue sensor's circuit is open
What the manual's checks are
Its wiring and continuity
E47The pressure sensor isn't connected
What the manual's checks are
Its wiring and continuity
E99The display and the control board aren't talking
What the manual's checks are
The wiring between them
MoreEvery LED pattern on the first Reno regular boiler
The first Reno regular boiler, of 2004, shows a fault as a pattern on six LEDs, numbered 1 to 6 from the left. Whether the later ones use the same patterns isn't in any manual we could read.
1An ignition lockout
What the manual's checks are
The controls, the timer and the boiler's own controls
1 and 2An overheat
What the manual's checks are
Venting the boiler, then the pump
1 and 3No fan speed signal
What the manual's checks are
The fan and its wiring
1, 2 and 3The flue is too hot
What the manual's checks are
The pump
4A flame circuit fault
What the manual's checks are
The flame detection lead
1 and 4A gas valve drive fault
What the manual's checks are
The ignition control board or the gas valve
2 and 4A control board fault
What the manual's checks are
The main control assembly
1, 3 and 5A control board fault
What the manual's checks are
The main control assembly
2, 3 and 5A control board fault
What the manual's checks are
The main control assembly
1, 4 and 5A control board fault
What the manual's checks are
The main control assembly
2, 4 and 5The flame was lost five times in four minutes
What the manual's checks are
The flame lead, then the gas pressure while firing
2, 3, 4 and 5The heating flow sensor has shorted
What the manual's checks are
Its wiring and resistance
1, 2, 3, 4 and 5The heating flow sensor's circuit is open
What the manual's checks are
Its wiring and continuity
2 and 6Low mains voltage, under 180 volts
What the manual's checks are
The incoming supply and its wiring
1, 2 and 6A mains frequency fault
What the manual's checks are
The supply, checked by a qualified electrician
1, 2, 3 and 6An OpenTherm sensor fault
What the manual's checks are
Its wiring and resistance
1, 2, 4 and 6The heating return sensor has shorted
What the manual's checks are
Its wiring and resistance
3, 4 and 6The heating return sensor's circuit is open
What the manual's checks are
Its wiring and continuity
1, 3, 4 and 6The flue sensor has shorted
What the manual's checks are
Its wiring and resistance
2, 3, 4 and 6The flue sensor's circuit is open
What the manual's checks are
Its wiring and continuity
All sixThe display and the control board aren't talking
What the manual's checks are
The wiring and connections
MoreEvery code on the QuanTec
A QuanTec shows E and F codes, and its user guide gives owners a step or two for some before the call. These are the combi guide's codes. The system and regular boilers' codes weren't found.
E01Failed to light
What its guide asks of you
See that your other gas appliances work, reset, then ring us
E02A false flame lockout
What its guide asks of you
Ring us
E03An overheat lockout
What its guide asks of you
Top up to 1.0 bar, bleed the radiators, see that the radiator valves are open, reset, then ring us
E05A fan fault
What its guide asks of you
Ring us
E08A flame circuit failure
What its guide asks of you
Ring us
E09A gas valve feedback fault
What its guide asks of you
Ring us
E12A memory lockout
What its guide asks of you
Ring us
E15A sensor drift lockout
What its guide asks of you
Top up to 1.0 bar, bleed the radiators, see that the radiator valves are open, reset, then ring us
E16, E17 and E18A sensor stuck lockout
What its guide asks of you
Top up to 1.0 bar, bleed the radiators, see that the radiator valves are open, reset, then ring us
E21An internal lockout
What its guide asks of you
Ring us
E33The return sensor has a fault
What its guide asks of you
Ring us
E34A low mains voltage lockout
What its guide asks of you
Ring us, or an electrician
E35The flow sensor has a fault
What its guide asks of you
Ring us
F07The flue sensor has a fault
What its guide asks of you
Top up to 1.0 bar, bleed the radiators, see that the radiator valves are open, reset, then ring us
F13A remote reset lockout
What its guide asks of you
Power off and back on, press reset, then ring us
F37Low water pressure
What its guide asks of you
Top up to 1.0 bar, bleed the radiators, see that the radiator valves are open, reset, then ring us
F40The water pressure is too high
What its guide asks of you
See whether the gauge reads over 2.8 bar, bleed the radiators, reset, then ring us
F47The pressure sensor isn't connected
What its guide asks of you
Ring us
F52The hot water sensor has a fault
What its guide asks of you
Ring us
F53A flue temperature sensor lockout
What its guide asks of you
Ring us
F82 (30C-SA)The condensate level alarm
What its guide asks of you
Ring us
The causes in these panels keep each manual's order. They aren't ranked by how often they happen.
Sources: Johnson & Starley's user instructions and installation manuals for the Reno (2004 to 2012) and the QuanTec (2016 and 2018), from its own document archive and archived copies, read on 11 October 2026.
How do you reset a Reno or QuanTec, and top up its pressure?
A Reno or a QuanTec is reset with its own button, once, as its user guide shows:
- Reno combi and system: open the flip-down door across the bottom (pull its corners towards you) and press Reset. If the fault comes back, turn the boiler off and ring us.
- The first Reno regular boiler, of 2004: turn the heating control to OFF, then back on.
- QuanTec: press the reset button, marked K4, twice.
Topping up a QuanTec: the gauge is under the boiler, on the left-most pipe. Johnson & Starley says to top up below 0.3 bar. The steps are these:
- See that the filling loop's valves are closed.
- Take off the loop's two caps, and fit the loop.
- Open the valves, and close them at 1 to 1.5 bar.
- Take the loop off at the left, and angle it upwards.
- Put the caps back.
If you can't, or the pressure keeps dropping, ring us.
Topping up a Reno: the pressure shows at the lower right of the display and should read at least 1.0 bar. The Reno's guides say a competent person fills and tops up the system, after looking for a leak, so ring us.
No pilot to light: every Reno and QuanTec lights itself. A plume of steam at the flue outside is normal.
If you smell gas, don't reset anything. Ring the National Gas Emergency Service on 0800 111 999.
Sources: Johnson & Starley's user instructions for the Reno, the first Reno regular boiler and the QuanTec, its Reno installation manual and its FAQs.
Do you cover my part of London?
Yes: we cover all of Greater London, in every borough north and south of the Thames. We fit new boilers in place of Johnson & Starley boilers. Pick your side of the river to see the areas.
North of the river
Every borough north of the Thames: Barnet and Enfield at the top, Hillingdon in the west, Havering in the east, and central London in between.
South of the river
Every borough south of the Thames: Richmond and Kingston in the west, Bexley in the east, and down through Croydon to Sutton and Bromley.
Johnson & Starley: your questions
Does Johnson & Starley still make boilers?
No, Johnson & Starley no longer sells boilers. Its products today are warm air heaters and air filtration. It keeps the Reno and QuanTec manuals in an archive for past and discontinued products. The company itself still trades, as it has since 1922.
Is my QuanTec still under guarantee?
A QuanTec may still be under guarantee. It was sold with an 8-year parts and labour guarantee and was still listed in 2024. Your guarantee letter gives the dates and terms. The QuanTec's user guide says the guarantee needs a service every year.
Is my Johnson & Starley a boiler or a warm air heater?
A Johnson & Starley appliance is a boiler if it is a Reno or a QuanTec. Warm air heating has been the company's main business for a century, so one with another name may well be a warm air heater. Not sure? Ring us, and we'll ask what it is called and what it does.
What do E37 and F37 mean?
E37 on a Reno and F37 on a QuanTec both mean the water pressure in the heating is low. A Reno stops at 0.6 bar, and a QuanTec below 0.3 bar. A QuanTec's guide shows owners how to top it up, and a Reno's guides leave that to a competent person. If the pressure keeps dropping, ring us.
How do I reset a QuanTec?
A QuanTec is reset by pressing its reset button, K4, twice, as its user guide shows. A Reno has a Reset button behind the flip-down door at the bottom. Reset once, and if the code comes back, ring us.
Can you replace a Johnson & Starley boiler in an emergency?
Yes, a Johnson & Starley boiler that has stopped can be replaced in an emergency. We fit emergency replacements, so ring us day or night. We'll ask what the boiler is doing and say when an engineer can come.
What does a new boiler cost?
The cost of a new boiler depends on the boiler, your home and what the job needs. Your quote, from photos or after a free survey visit, sets it all out in writing before any work starts. How our rates and quotes work.
Do I need to know which Johnson & Starley boiler I have?
No, you don't need the model to ring us. Say what your Johnson & Starley boiler is doing, and we'll ask the rest. Photos of the boiler, its flue and where it sits help us quote for a new one.
Don't know what has failed? You don't have to.Ring and say what you can see or hear. Finding the fault is our job.
Calls answered 24 hours a day
A real person answers and gives you the rate on the call. No work starts until you say yes, and repairs are guaranteed for 12 months: parts, labour and any return visit.
