Intermittent Fault 105E

[GeorgeBramwell]

Got a phone call from a friend. Baxi 105e combi. Intermittent DHW - sometimes works, sometimes does not. The pressure valve opens and activates the two micro switches. He tested the microswitches and they work. He tested the pressure switch and that works. Check to see if any lose connections, there are none. There are three sensors on the combi. Sometime the DHW just stays off. To get it to work, he turns on the DHW tap, then turns the combi off and on at the mains. This brings in the burner.

Any Baxi men shed any light on the problem?

 

[baxpoti]

Does the dhw demand light come on when it fails to light?

 

[GeorgeBramwell]

Does the dhw demand light come on when it fails to light?

From memory, no.