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I have a strange problem.....
I have an Ideal Classic RS250 boiler.
Honeywell 3 port valve brand new
Danfoss cylinder stat brand new
Grundfos pump
FP715 controller
I had an issue with the hot water getting scalding hot so replaced the cylinder stat with no success. I then found that a few radiators were heating slightly when no CH was be called for, so replaced the 3 port valve & figured that would cure the problem. Not all.... I then started to question the existing Y plan wiring so ripped it all out & rewired it from scratch. I ran off all of the near boiling hot water held in the tank set the cylinder stat at 65* the water temperature hit the call point at 65* and turned off Jackpot!! I then turned the room stat on CH came on all looking good yes I thought I've cracked it. First thing the following morning I opened up the airing cupboard to check the cylinder stat was still working correctly & once again found the water boiling again even though the pump hadn't been running. I then decided to turn off the whole heating supply no voltage to any thing at all and left it for 12 hours. I checked the 3 port valve and it was red hot as was the HW & CH either side of the 3 port valve. I then focused in on the boiler with no voltage applied & just the pilot on which I assumed should be a single flame & found the following flame
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I tested the boiler thermostat & no problems working fine. Powered up everything again set the room stat to call, boiler fires up as it should, lowered the boiler stat & it works cutting out main burner & back to my larger than normal pilot light.
Is the gas valve faulty ? As I assume either the pilot is getting to much pressure or the main boiler burner is feeding the pilot somehow ?
It would appear that even though it's on pilot which is surely the fault over a period of time the boiler is just constantly heating through convection ?
Thanks in advance if anyone can shed some light on this