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Dunkirk boiler series PSB-5D

PB1
Member Posts: 2
Hi, I have a Dunkirk boiler series PSB-5D. It’s about 20 yrs old. When our home thermostat calls for heat it heats up ok but will not shut off when the set temperature is reached. I have to switch it off manually. We have changed our home thermostat and the same thing happens so it must be a problem with the boiler. Any ideas?
0
Comments
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How do you switch it off manually.....power switch or gas valve?0
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It’s just a switch. Looks like a light switch.0
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If power disconnect shuts it down and tstat is satisfied and off, then perhaps there is a sticking relay for the boiler.
You could disconnect the tstat wires at the boiler to see if it still stays on.
If you see the relay, there is also a high tech method to see if it is sticking....sometimes.
I take a rubber handle screwdriver and "thump" the body of the relay with the handle. If boiler shuts down that is it.
Pictures might help.0
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