Recent: Find the charger or how to convert the battery?

Mend Vaillant Home Heating Systems

Mend Heating, Home Heating Systems
Find out how to mend it for free.
Ask Question
Mend Heating, Home Heating Systems
Free repair help for Vaillant home heating systems

Mend home heating systems ...

Mend 30 boiler fire flashing
2

Worcester 30 Cadillac combi boiler won’t fire up and the EA?

my worcester 30 cdi combi combi boiler wont fire up and ''ea'' keeps flashing? my worcester 30 cdi combi bo... [Read more]
Mend Heating, Home Heating Systems
1

Greenstar 24Ri boiler, fast flashing - can I reset?

Greenstar 24Ri boiler won't light and the blue light is fast flashing. From the manual I can see that the iss... [Read more]
Mend Heating, Home Heating Systems
1

Oil fired boiler thermostat?

I have a Velaire 110/135 oil fired domestic boiler. I think the boiler thermostat may be faulty. The manual sa... [Read more]
Mend Heating, Home Heating Systems

Siemens transmitter error?

Rdj10rf stuck on start screen after putting in new batteries
Mend gas ignite hand

Kohlangaz Gosford HE fire?

My Kohlangaz Gosforth HE gas fire will not ignite, My hand set controller is displaying E56 , it will also not... [Read more]
Mend Home Heating Systems

Mend > Home Heating Systems

Mend Vaillant Saying Code Com

my vaillant boiler is saying a code com on it ?

what do I do when your boiler says com on it an no heating or hot water

mel
December 2016
VaillantHeating, Home Heating SystemsSaying Code Com
It refers to a communication fault between the two circuit boards, I believe the display actually reads CON? It could be a fatal board fault or a poor connection between the two, with the power off, try separating and reconnecting the boards

Carefree
December 2016
You do a Google search for - say "Valliant 'Model' Com Fault" but you replace 'Model' with the exact model number of your boiler.

XXX
December 2016
Mend Heating, Home Heating Systems
Free repair help for Vaillant home heating systems
Mend vaillant f22 fault

Vaillant F22 fault?
Mend 828e hot water

Vaillant 828E - no hot water?
Mend boiler working fire

Vaillant condensing boiler ecoTEC plus?
Mend vaillant boiler pcb

Vaillant eco plus 531 boiler?
Mend vaillant off 5

Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Mend eco tec boiler

how do I rectify the fault as detailed below?
Mend boiler vaillant ecotec

can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Mend bottom heating working

how to fix water pressure its down at bottom of grey part?
Mend vaillant central problem

Vaillant vcw gb242 eh central heating problem?
Mend hot water comes

Hot water comes and goes!?
Mend vaillant f22 water hot

Vaillant ecotec 831 plus?
Mend problem pressure combi boiler

Problem with the pressure in combi boiler?

Other models...

Vaillant 242e TurbomaxVaillant 824EVaillant 837Vaillant 9125610777Vaillant eco tec pro 28Vaillant ecotec 360Vaillant F-75-50-ppVaillant HE 24Vaillant pro 28Vaillant VCW 25/1 T3Vaillant VUecoTECplus418Vaillant VUW 242/1E

How to mend ...

Find out how to mend just about anything howtomendit.com for free repair help, information and advice.

Related Categories

Mend Convector Heaters
Convector Heaters
Mend Fan Heaters
Fan Heaters
Mend Oil Filled Radiators
Oil Filled Radiators

Mend Heating, Home Heating Systems
Free repair help for Vaillant home heating systems

Try fixfault.com to fix home heating systems.