Emergency & Fixed Cost Boiler Repairs

1. Tell us what needs doing and discuss the job with an engineer
2. Get a no-obligation personalised quote
3. Pay online after the job’s done

All work and parts are guaranteed for 12 months


Whether it’s because you’re suddenly faced with the unexpected cost of hiring an engineer or because it’s an emergency boiler repair, it can be a very stressful time. We’ve outlined the main options available to homeowners dealing with a broken boiler to help your home get back to normal as soon as possible.


Boiler emergency?

 

 


One Off Boiler Repair

A one off boiler repair is common in emergency circumstances; for example when you’re unexpectedly left without heating and hot water in the middle of winter or you’ve got a water or gas leak in your home. You can hire an engineer to carry out a one off boiler repair as and when a fault occurs. In fact, many engineers offer an emergency call out service which could be available on a 24 hour basis.

The cost of this could be based on the time the engineer takes to repair your broken boiler. In this case an engineer will usually estimate the time that will be needed and the cost of the job, but this could increase if unexpected complications arise.

Alternatively, many engineers offer a fixed price boiler repair. This is also known as fixed fee boiler repair and means the price you’re quoted won’t change, even if the job takes longer than initially planned. Parts and labour should be included in this price so there are no surprises down the road.

Boiler Repair & Servicing Contracts

Many heating installers offer an ongoing boiler repair contract in addition to a one off boiler repair service. This is like insurance for your boiler and, as long as you pay a monthly fee, an engineer will come out to repair your boiler or heating system with no extra charges. These contracts can give great peace of mind that should you need emergency boiler repair, you won’t be faced with a large bill out of the blue.

These contracts are often arranged via monthly payments which vary in line with how much is included in your cover. For example some will only cover your boiler while others also include the controls, radiators, drains and plumbing. They may also include annual servicing of your boiler or even protect you against accidental damage.


Need a boiler repair?

 

 


Common Boiler Repairs

Only a Gas Safe registered engineer can diagnose your broken boiler, but we’ve put together some of the most commonly reported faults which can cause your heating system to fail.

No heating or hot water

Common issues with boilers begin with airlocks, broken diaphragms, motorised valve failure, low water levels or thermostat problems. It may be that parts need to be replaced.

Dripping and leaking

Leaking could be due to a broken seal or pressure valve, corrosion of the pipes or even incorrect installation. Never try to repair a leaking boiler yourself – you will need to contact a Gas Safe registered engineer to ensure the issue is fixed safely.

Strange noises

Banging or gurgling could be caused by air trapped in your heating system or pump failure. A high pitched noise like a kettle boiling could be due to a build up of limescale or sludge in the system which restricts water flow in the heat exchanger causing it to overheat or boil.

Pilot light out

This could be related to the gas supply so it’s a good idea to check any other gas appliances you have before deciding the boiler is the issue. If the boiler is the only issue, it could be something like a broken thermocouple or a draught blowing out the pilot light. Remember that you should never carry out and work on your own gas boiler; get in touch with a Gas Safe registered engineer to carry out the repair.

Low pressure

Low pressure can prevent a boiler from functioning properly. This could be caused by a leak in the system, a broken pressure valve or recently bled radiators. You can try adjusting the pressure on your boiler but if you’re not comfortable doing so you should contact a Gas Safe engineer.

Condensate pipe frozen

Your boiler will have pipes which transport waste water away into an outside drain. If the pipe freezes in winter this may cause your boiler to stop working.

Thermostat problems

A broken thermostat may be inaccurately adjusting your heating or turning the heating off when it’s not supposed to. If you’re sure your settings and scheduling are correct, it may be time to invest in a new thermostat.

Radiators have cold spots

If only parts of your radiator (e.g. just the bottom) are getting hot you could have a build up of sludge or air trapped in them. You should be able to remedy the problem by bleeding the radiators.

Boiler keeps switching off

If your boiler keeps switching off then there is a very good chance there is an issue with the water pressure which may be caused by a broken component such as a closed valve or pump.

To accurately identify the cause of your broken boiler we recommend calling out a Gas Safe registered engineer to take a look.


Need a boiler repair?

 

 


What are Error Codes?

Sometimes a broken boiler will display what’s known as an error code or fault code. Depending on which brand and model of boiler you have this will indicate what’s wrong with your boiler and, in some cases, may even suggest a way to rectify the problem. Your boiler manual will include all the possible fault codes for your particular boiler. If you don’t have the boiler manual anymore, you can request one from the manufacturer.

Here are some examples of fault codes for the UK’s leading boiler brands. This list is not intended to diagnose your boiler as they may not be applicable to the specific model of boiler you have, but it gives you an indication of the range of issues a boiler can develop.

Worcester Bosch Boiler Error Codes

Fault Code Possible Cause
C7 Fan not running / Fan not running or airflow blocked
D1 Sensor wet or damaged (the boiler will block for 300 seconds before this condition)
D1 Sensor disconnected or damaged (the boiler will block for 300 seconds before this condition)
D1 Boiler overheat
E5 Primary flow sensor overheated
E9 The main heat exchanger has overheated.
Maximum temperature 105°C
E9 Maximum temperature sensor on the main heat exchanger has not been recognised
E9 Flue gas thermostat overheat
EA Gas valve coil disconnected

These are a sample of common errors, please find the full list of Worcester Bosch error codes here.

Baxi Boiler Error Codes

Fault Code Possible Cause
E53 Poor combustion – flue terminal may be blocked
E110 Over heated – try bleeding your radiators
E117 System water pressure high – try bleeding water from your radiators
E118 System water pressure low
E125 Overheat – try bleeding your radiators
E133 Gas supply fault
E4 Ignition failure
E09 Gas valve wiring fault
E10 Outdoor sensor error
E15 Gas valve connection fault

These are a sample of common errors, please find the full list of Baxi error codes here.

Ideal Boiler Error Codes

Fault Code System Behaviour
C0 BCC Activation Fault
C2 BCC Fault
F1 Low Water Pressure
F2 Flame Loss
F3 Fan Fault
F4 Flow Thermistor
F5 Return Thermistor
F6 Outside Sensor Failure
F7 Low Mains Voltage
F9 Unconfigured PCB
L1 Flow Temperature Overheat or No Water Flow
L2 Flame Loss
L5 5 Boiler Resets in 15 minutes
L6 False Flame Lockout

These are a sample of common errors, please find the full list of Ideal boiler error codes here.

Vaillant Boiler Error Codes

Fault Code Possible Cause
F.00 Fault: Flow temperature sensor
F.1 Lack of gas, a fault with the ignition or flue, or you may need to adjust the gas valve or replace a defective electrode lead
F.4 Ignition fault.
F.5 The system has suffered a fault due to overheating.
F.6 Your flow NTC has developed a fault.
F.17 Check the polarity of your system
F.24 Pump-related faults – the pump could have failed, it may have over run or there could be an issue with the air lock

These are a sample of common errors, please find the full list of Vaillant error codes here.

Vokera Boiler Error Codes

Fault Code System Behaviour
_St autostop
_CL call for service
A01 ignition failure flames not sensed internal fault
A02 limit thermostat fault
A03 fan tacho signal fault
A04 insuffcient system water pressure
A06 DHW thermistor fault
A07 primary flow thermistor fault Primary (fl ow) thermistor over temperature Temperature differential
A08 Return thermistor fault Return thermistor over temperature Temperature differential inverted
A09 Flue thermistor or fl ue thermistor A09 counter fault Flue thermistor over temperature
A11 false flame
A77 low temperature thermostat fault
ADJ Calibration
ACO Service operation
P Preheating function active
P Blinking Preheating function running
01 Failure to ignite
02 Overheat
03 Problem with fan/flue
04 Insufficient water pressure
05 Reset as described for code 01
06 Hot water thermistor open circuit
07 Primary thermistor open circuit

These are a sample of common errors, please find the full list of Vokera error codes here.

Glow-worm Boiler Error Codes

Fault Code Possible Cause
F.00 Fault: Flow temperature sensor
F.00 Fault: Flow temperature sensor
F.10 Short circuit: Flow temperature sensor
F.11 Short circuit: Return temperature sensor
F.12 and F.91 Short circuit: Cylinder temperature sensor
F.13 Short circuit: Domestic hot water cylinder temperature sensor
F.20 Safety switch-oft. Overheating temperature reached
F.22 Safety switch-oft. Low water pressure in the boiler
F.23 Safety switch-oft. Temperature difference too great (NTC1/NTC2)

These are a sample of common errors, please find the full list of Glow-worm error codes here.

Ferroli Boiler Error Codes

Boilers Fault Code System Behaviour
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C A01 No burner ignition
OPTIMAX HE PLUS 38C A01 The burner fails to light
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C A02 Flame present signal with burner off, possible electrical fault
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C A03 Over temperature protection activation
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C A04 Fume thermostat fault
OPTIMAX HE PLUS 38C A04 Fume extraction duct safety device activation
DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C A05 Fan fault or fume pressure switch fault

These are a sample of common errors, please find the full list of Ferroli error codes here.

Potterton Boiler Error Codes

Fault Code Possible Cause
E09 Gas valve wiring fault
E10 Outdoor sensor error
E15 Gas valave connection fault
E20 Central heating thermistor sensor fault
E28 Flue thermistor fault
E40 Central heating return thermistor fault
E50 Domestic hot water sensor fault
E53 Flue obstruction
E78 Water pressure sensor fault
E110 Boiler overheat tripped
E117 System pressure high (>2.9 bar)
E118 System pressure low
E125 Primary water circulation fault
E133 Ignition fault
E135 Internal error
E154 Primary flow fault
E160 Fan fault

These are a sample of common errors, please find the full list of Potterton error codes here.

Viessmann Boiler Error Codes

Fault Code System Behaviour Cause of Problem
02 Burner control switches to lockout Safety chain was activated
04, 05, 06, 08 Burner control switches to lockout Fan speed too high/low at start
07, 09 Burner control switches to lockout Basic level of air pressure threshold in standby mode not correct
0A Burner control switches to lockout Fault, fan speed
0D Burner control switches to lockout Reset button pressed repeatedly or while burner is running
1A, 1B Burner blocked Flow sensor 1, 2 Faulty
1F Burner blocked Differential flow rate too large
25 Boiler operates with high boiler water temperature Emissions test switch turned to “hand symbol” for 30 minutes already
35 Boiler does not activate Reset button (pressed while burner is OFF) with Emissions test switch turned to “hand symbol”
A5 N/A Short circuit / open circuit

These are a sample of common errors, please find the full list of Viessmann error codes here.

Alpha Boiler Error Codes

Fault Code Model Affected Fault Possible Cause
1 All Ignition failure Gas supply Check pressure tubes Ignition electrode gap Flame sensor electrode gap Ignition generator or lead Flame sensor electrode lead Gas valve setting Gas valve PCB
2 All Overheat boiler lock out Pump or flow problem Blocked heat exchanger Air in heat exchanger Overheat thermostat Thermal fuse (if open circuit then replace primary heat exchanger)
3 All High flue thermostat temperature Blocked or restricted primary flow Heat exchanger air flow blocked Flue restriction Flue sensor fault
4 All Gas valve electrical connection fault Gas valve lead connection fault Faulty gas valve Faulty PCB
5 All Heating flow sensor fault Flow sensor wire connections Flow sensor faulty
6 All DHW sensor fault DHW sensor wiring connection DHW sensor faulty
8 All Maximum number of resets Refer to fault history codes (INFO menu d9)
10 All Primary system pressure low Check expansion vessel pressure (1 bar) Leak in system Expansion relief valve operated Primary pressure switch

These are a sample of common errors, please find the full list of Alpha error codes here.
 


Need a boiler repair?