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Burnham ES27 no heat - FIXED!!
Woke up to a cold boiler (Burnham ES27).
The boiler reports the following on the IQ Boiler Control:
StA (Status) 1 Standby
hr (Heat Request) OFF
The system though is calling for heat (through TT terminals on IQ Option Board).
The Option Board connects with a wiring harness to the IQ Boiler Control.
I swapped out the IQ Boiler Control with a spare - same results.
So that leaves either the wiring harness, or the IQ Option Board (neither of which I have spares for).
The boiler was installed in 2011 and has been reliable until now.
Anyone got any ideas for troubleshooting this?