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Andrew Smith
Andrew Smith, Engineer
Category: UK Plumbing
Satisfied Customers: 3631
Experience:  Domestic Gas, Commercial Gas, LPG, Unvented Hot Water, Part P Electrical, Commercial Catering
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Have a Halstead Ace gh that was intermittent now seems to

Customer Question

Have a Halstead Ace High that was intermittent now seems to have died completely. Basically it was firing up if fan would start, replaced fan and still didn't start (plumber who turned up once and was going to change this, then they cleared off on holiday never to be heard of again). This didn't resolve the intermittent problem, only turning on and of and/or wiggling the wires would. So deduced it was the PCB, changed that but still no luck, have checked all the loom for connectivity and flow switches operate. Any suggestion as to next stage would be welcome.
Submitted: 2 years ago.
Category: UK Plumbing
Expert:  Andrew Smith replied 2 years ago.

It sounds like the air pressure switch, this tells the boiler that the fan is running

Customer: replied 2 years ago.
Andrew I thought about this but the fan is not starting up for the APS to detect any differential in the venturi. manual mentions checking whether AS is closed or not - now do I tell if it is closed?
Expert:  Andrew Smith replied 2 years ago.

When closed there is continuity through it