Baxi Solo 3pf 80 Flow temperature

[kdpaul]

My boiler is suffering from an extremely long cycle (20 min. on / 60 min. off). The thermistor cuts out at 80ºC flow as it should but the boiler doesn't re-start until ~22ºC.
By this time all the rads are cool again and I can't get the house hot enough to work off the room thermostat.
I've fitted a new PCB a month ago as it was burnt out, it came with a new potentiometer fitted and I fitted a new thermistor.
Any ideas welcome?

 

[stumpydick]

when boiler goes off, does pump continue running, or does it stop?

 

[kdpaul]

Pump continues to run

 

[stumpydick]

perhaps the gas valve solenoids may be faulty, you need to get a registered installer familiar with the way the boiler operates to take alook,

 

[kdpaul]

Got it checked out and they altered the Gas pressure. Seems to be working fine now. Thanks for your advice.

 

[Agile]

I dont see how just the gas settings could have caused that. But see if its cured the problem. Are you sure he did not do anything else> perhaps there was a bad connection which he disturbed which has righted the fault.

There is another part which is gas related which I would suspect but we are not allowed to give DIY gas repair advice here.

Tony