Baxi Solo 2 40/PF fan "oscillating"

Completely different problem than a recent post, and a problem that I've had for quite a while now...

Baxi Solo 2 40/PF Boiler.

When the boiler is supposed to fire up, the boiler can go through a phase of firing up the fan, then cutting it off a second later. This results in a quiet "whoophm, whoopm, whoopm" noise (around 0.5Hz) for the few minutes before "something" takes hold, the fan spins normally and the boiler fires up properly (with a healthy "click" of some relay somewhere actuating)

During all this, the proverbial "tap" on the side does cure this (boiler fires immediately).

So.... what's this likely to involve?, is there some protection circuitry around the fan that might be goosed?

As always, any help appreciated.

Mike

Reply to
Mike Dodd
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Sounds very much as you would expect if the PCB (probably but not always a relay on it) has a fault. The power is applied to the fan which starts when the APS switches over the relay is meant to do so as well and keep the power to the fan going. If the relay is stuck the power gets cut and the fan slows down until the APS switches back.

Reply to
Ed Sirett

replying to Mike Dodd, John wrote: Hi I have a Baxi solo 2 40 pf burner will not come on only if you open the case it will then work fine until l turn the clock to off then it will not come on again the air flow switch has been changed many thanks

Reply to
John

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