burnham scg gas boiler control problem

paul_92

check if you have 24 v at the y terminal on that control when you have the t-stat disconnected .. you shouldnt have voltage there when theres no call for heat

Chris_61

control problem with burnham scg gas boiler

I started a burnham scg gas boiler today and it runs continuously without any call for heat, tt disconnected and it only shuts down by the hi limit control.

I replaced the combo transformer/relay, honeywell R8285D, still the same problem. The blower relay pulls in as soon as the boiler is energized and the boiler fires up. It seems that there may be a problem with the factory control wiring. Any suggestions.

CG

paul_92

t stat

so you replaced the fan center..make sure with your meter that the t-stat isnt calling between terminals r and g ... the problem has to be at that point ..unless there are some serious wiring issues and you need to get a pro

Chris_61

The t-stat wires are disconnected from the relay and it still cycles.

paul_92

????

when you replaced that control did you replace the relay that was in it too??

Chris_61

I put the original control back in and I have the same problem. The customer has heat for the weekend and I'll be back there Monday to check the voltage at the y terminal. thanks for the input.