Boiler on the Blink!

Get the warmth back in your home! Use our Boiler Fault Codes Guide

If your boiler develops a problem or error, it often displays boiler fault codes to help you diagnose it on the front panel.  These can be confusing as they appear as a variety of different numbers and letters, specific to the boiler itself and the issue.  Here at 24/7 Emergency Plumbing Contractors, we want to make sure that our customers have as much information and assistance as possible, so below we have developed a list of all the boiler fault codes which could appear on a Worcester Bosch, Vaillant, Baxi or Ideal Heating boiler, which we install & maintain. Please rest assured faults and errors are a rare occurrence with today’s modern and reliable boilers.

If your boiler is showing a fault, contact us to arrange a repair with a Gas Safe registered engineer. We offer an emergency repair service, which is available 24/7 one of our engineers will never be far away. We know that a boiler breakdown can be frustrating, so at 24/7 Emergency Plumbing Contractors we are here to help, no matter how small the issue. 

Avoid costly repair bills, sign up to one of our boiler care plans today!

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Identify Boiler Fault Codes

9A

Boiler has been fitted with incorrect Heat Control Module (HTM).

9U

The code plug could be faulty or not properly connected.

B7

You need to replace the control board.

C6

The system is running too fast or too slow.

C7

Fan is not running or the airflow could be blocked.

D1

Sensor could be wet, damaged or disconnected. The boiler will block for 300 seconds.

D1

Boiler is overheating.

E2

The Flow sensor has shorted, is damaged or disconnected.

E5

The primary flow sensor has overheated.

E9

The main heat exchanger has overheated as the main temperature is 150 degrees.

E9

Maximum temperature sensor on the main heat exchanger cannot be recognised or has failed.

E9

The flue gas thermostat has overheated.

EA

Failure after four ignition attempts. The boiler will wait 30 seconds before another attempt is made.

EA

A flame has been extinguished due to either moisture in the sump, a blocked sump or strong wind in the flue.

EA

Gas valve coil has been disconnected.

EA

Flame has not extinguished within first 4 seconds of ignition.

EA

There is an error as the pump is not detecting water. Check the pressure gauge and re-pressurise to 1 bar.

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.

 

 

0

 The boiler is in standby mode awaiting either a central heating call or hot water demand.

C

The boiler has a call for central heating but the appliance has reached the desired temperature set on the boiler.

C

The boiler is in operating in central heating mode.

D

The boiler has a call for hot water but the appliance has reached the desired temperature set on the boiler.

D

The boiler is operating in hot water mode.

F

The boiler is operating in frost mode.

EcoMax Pro 18/28E Fault Code

Possible Cause

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 (temperature sensor) has developed a fault.

F.17

Check the polarity of your system

F.21

The pump could have failed, over run or there could be an issue with the air lock.

 

 

Turbomax Plus 824/8E

         Possible Cause

F.00 N

           The flow NTC (Negative Temperature Coefficient Thermostat) cable is either defective or broken and needs replacing.

F.01

          The flow NTC (Negative Temperature Coefficient Thermostat) cable is either defective or broken and needs replacing.

F.10

          Short circuit with the NTC.

F.13

          Short circuit with the NTC.

F.20

          Your boiler has exceeded the maximum temperature and needs to cool.

F.22

          There is dry fire, low water in the system which is overheating. You may have a defective pump or pump lead.

F.24

          Your pump could be obstructed, at low capacity or there could be trapped air. The pressure of your system could be too low.

F.28

          There is insufficient gas, a defective electrode, ignition lead or electronic ignitor. 

F.29

          Your flame or pilot light has gone out. Check your flue duck or gas supply to see if there is a problem. 

F.60

          Your cable loom which connects your gas valve may have short circuited. You could have a defective gas valve or electronic control system.

F.61

          Your cable loom which connects your gas valve may have short circuited. You could have a defective gas valve or electronic control system.

F.62

          Your boiler has exceeded the maximum temperature and needs to cool down.

F.63

          This is an electronic fault within your system. An error with your EEPROM (electrically erasable programmable read-only memory.)

F.64

           Your flow or backflow NTC has suffered a short circuit or an electronic fault.

F.65

           Electronic system temperature too high, potentially due to an external heat source or electrical fault.

F.67

           Electronic fault in flame system.

E09

Gas valve connection cable

E15

Gas valve fault

E20

Central heating NTC *Negative Temperature Coefficient fault

E28

Flue fault

E40

Central heating return fault

E55

Calibration required

E109

Pre-circulation fault

E110

Safety thermostat operated

E117

Water pressure too high

E118

Water pressure too low

E125

Circulation fault (primary)

E128

Flame failure

E130

Flue NCS operated

E133

Gas supply interrupted or flame ignite failure

E134

Gas valve open without gas – time elapsed

E135

Interruption of gas supply

E154

Flow/return sensor temperature test

E160

Fan fault

E270

Circulation fault (dry fire)

E321

Hot water NTC fault

E384

False flame

E09Gas valve wiring fault
E10Outdoor sensor error
E15Gas valve connection fault
E20Central heating thermistor sensor fault
E28Flue thermistor fault
E40Central heating return thermistor fault
E50Hot water sensor fault
E53Flue obstruction
E55Calibration issue
E78Water pressure sensor fault
E92Combustion test alarm 
E109Poor circulation
E110Boiler overheat tripped
E117System pressure too high
E118System pressure low
E119System pressure low
E125Primary water circulation fault
E128Loss of flame
E129Loss of flame
E130Flue thermostat sensor tripped (lockout)
E131Flue overheat lockout
E133Ignition fault
E135Internal error
E151PCB fault
E152PCB fault
E154Primary flow fault
E160Fan fault
E161Fan fault
E164Hot water sensor error
E167PCB fault
E168PCB lockout
E193Circulation issue
E270Dry fire
E317Wrong power supply
E321Hot water thermistor fault
E384Flame detected when gas valve off
E385Low voltage

Boiler Make & Associated Error Codes

ATAG – 133

Baxi – E133 or E28

Glow-worm – F1, F4, F28 or F29

Main – E133

Potterton – E133

Vaillant – F28 or F29

Viessmann – F4EE

Worcester Bosch – EA229 D5

Ideal L2

“Ok I’ve identified the issue, now how do I fix it?”

First things first, you need to find the part of the pipe that has the blockage so you know you’re thawing out the right area. To help you, there will often be a bend or dip there in the pipe. There are several different methods you can use to thaw it out:

* applying a hot water bottle to the area

* applying a microwaveable heating pack

* applying a warm cloth

* pouring hot water over it using a watering can. (Caution – do not use boiling water as this could melt the plastic pipe!)

Once you have unfrozen the pipe, your boiler should restart automatically, however you might need to reset it. Check the manual to be sure.

“Can I prevent this from happening again?”

Yes, there are a few things you can do:

* covering the condensate pipe with foam insulation

* leaving your heating on overnight

* turning your thermostat up however your radiators may then be too hot

“I need help!”

If you would like help unfreezing or insulating your boiler’s condensate pipe, contact 24/7 Emergency Plumbing Contractors now and we will send out an engineer in no time at all.

 

These fault codes are designed to help an emergency boiler repair engineer diagnose the problem with your boiler. 

Without these fault codes, they’d be aimlessly fault finding, which would end up taking them much longer than they should and costing you much more than it should. 

Working on gas appliances is not a DIY job, and could cost lives if done incorrectly. Always ask to see the engineers Gas Safe credentials.

 

Our company has been using 24/7 Emergency Plumbing Contractors for over 18 months, they have always been responsive whether the job is urgent or not, large or small.
Amelia Sidaway
Area Manager