The system worked perfectly with no disturbances, annual service 3 weeks ago, suddenly the HW to the main house failed. House and extension fed from one Ideal Mexico with individual/independent Honeywell ST7100 progs. Honeywells cross installed to check integrity, good, all red light selections work but HW selection man or auto prog does not initiate boiler. System Honeywell motorized valve checked in man and auto, no solution. Is it a cylinder stat failure or something more sinister?
Immersion heater is providing HW but eating electricity! Any reasonable idea pursued, thanks!
Immersion heater is providing HW but eating electricity! Any reasonable idea pursued, thanks!