Fix Fault Vaillant

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We have 1196 questions about fixing 'vaillant' in category Heating, Home Heating Systems

Vaillant ecotec 831 plus?

Following a F22 fault where we had no heating and only cold water from the hot water tap, I topped up the system, but went to far the needle went into the red. I bled the radiators to reduce the pres ... more
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Vaillant F22 fault?

f22 fault how to fix
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Vaillant eco plus 531 boiler?

replaced pcb board f70 ,asks for password no,17, but no 17 on display ,goes from 16 to 22 .on boiler vaillant 831
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Vaillant Turbomax pro?

Vaillant Turbomax pro. The central heating will not come on but the hot water is working ok
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Vaillant 828E - no hot water?

Green light is not flashing when hot water tap is running. Central heating works ok
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Vaillant condensing boiler ecoTEC plus?

The boiler stopped working and showed fault F22 dry fire. I changed the 3 amp fuse in the electric switch and pressed the test button in the consumer unit. A switch dropped down which I then pushed up ... more
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how do I rectify the fault as detailed below?

occasionally my vaillant eco tec pro combi boiler does not come on in the morning and a bmu error code appears on the vrt 360f stat how can I fix this problem
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Water heater / boiler trips after ignition?

Vaillant VP5-ZE on demand water heater, ignites, but the ignition sparks continue to spark and the system shuts down. Is there a sensor that detects ignition?
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Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?

My boiler lights easily but after 5 minutes there is a click and then it goes off and the pilot goes out.
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how to fix water pressure its down at bottom of grey part?

the heating and hot water working but pressure looks to low Vaillant ecoTEC condensing boiler
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Vaillant vcw gb242 eh central heating problem?

Hi just wondered if anybody can point me in the right direction, central heating wont come on, if you press the diverter valve in so it hits the micro switches it works but if you let go it turns off, ... more
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Hot water comes and goes!?

I live in Spain and have a Vaillant Geyser (Water Heater) References MAG premium ES 19/2 GXI, GI and MAG premium ES24/2 GXI Appliance is 10 years old and recently had a 'membrane ... more
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can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?

my boiler is a Vaillant ecotec 618 and is NOT a combi, I wish to replace the Potterton EP2 2 way programmer with a Center EHE0200361 RF programmable timer , is this new timer compatable with my boiler ... more
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vaillant ecoTEC plus boiler fault code - how to fix?

I have ave a vaillant boiler and just now i used the kitchen tap water and there is not hot water. And, the boiler is flashing F.22 and i don't know what this means! and the pressure has dropped to 0. ... more
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What does f.25 mean?

I have money in my meter but my vaillant boiler keeps saying f.25 the pressure is just above the first line what does this mean and what can i do to resolve it ?
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Vaillant igniting issue ( domestic ) not CH?

Hello to everyone, I have a Vaillant sine 18 T-3 combi boiler that was installed in 1985. Have had parts replaced over the years but now my cover with British gas has ended i have found it will only ... more
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Fix Fault - Heating, Home Heating Systems

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Fix Fault - Heating, Home Heating Systems

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