Recent content by valliant

Replaced the air pressure switch and same symptoms persist. The fan must clearly first have to operate at sufficient speed to create enough pressure in the gas intake to trigger the aps and start the ignition process. Am I correct in this deduction? Got the boiler working today for about five...

Fitted the entire system 10yrs ago - had the gas connection safety inspected and passed at the time of first commissioning - wouldn't be allowed to now so... Competent by experience/ but not above seeking advice and confident yes - the air pressure sensor/switch now removed for inspection. It...

Thanks spraggo. Feel competent, and have looked at simple instructions in the installation manual. The only doubt remaining is in what way I should check it - visually, mechanically or with some form of instrumentation? Or is it a matter of extraction and try refitting or then a new...

Hello, I have a Vaillant Ecomax VU 186E condensing gas boiler with an intermittant mystery fault. I'm hoping that with your collective experience, the following observations will point towards a single most likely common cause. It all started 10 days ago when the central heating was switched...