vaillant ecotec fault

[philharves]

Hi everyone, our vaillant ecotec pro28 has stopped working as it should, first fault, switch on central heating yellow light comes on ok fan and ignition ok, gas lights ok when fan speed increase kicks in all leds go out and display goes blank for a moment, then the sequence starts again. The radiators are warm but the hot water is cold.! When the hot tap is turned on the green led lights, yellow led lights, a second later led's go off.
Can anybody offer any advice, i've had the cowl off to eliminate the flue, cheched the spark electrode can't find anything obvious, no fault codes either. I' getting close to ringing vaillant

 

[dreadnoughtheating]

Any 'F' codes displayed?, forgetting the water pressure gauge, if you press the '-' button it should (I hope I've got this correct, its late....) display the internal pressure digitally - what is that reading?

DH

 

[Agile]

You should not have been doing those things when not gas trained. Get an RGI!

What you can do is to measure the mains input voltage with a moving coil meter.

Tony

 

[gas4you]

What you can do is to measure the mains input voltage with a moving coil meter.

Tony

All right to risk an electric shock then

 

[Agile]

There is no legislation to prevent anyone who thinks they are safe from using a test meter.

It should be obvious but that test was to be done during this cycling operation and not just a momentary test.

Tony

 

[gas4you]

There is no legislation saying that you cannot work on your own gas appliance in your own home.

But as we all know it would be rather stupid and possibly dangerous to do so.

 

[philharves]

the pressure is reading 1.7 bar, no fault codes are displayed, the status code reaches s.4 before the boiler starts the cycle again.