Posted by wore out on December 21, 2022 at 05:57:36 from (64.255.159.199):
In Reply to: Furnace posted by rlp in Co. on December 20, 2022 at 22:49:57:
[quote="CVPost-rlp in Co."]
Consider this... when the transformer primary was fed 240 Volts the output of it's secondary to the electronics would have been 50 to 55 Volts during the seconds (or more) it took for the thermal fuse inside the transformer to get heated up enough to melt and open!
Dunno if I would want to trust the electronics to control a GAS furnace safely after that event!
That being said, what is the make and model of the furnace, and what is the control system, does it have a separate circuit board, or is it a "smart'' valve with electronics inside the valve?
Hot surface ignition or spark?
What is the make and part number of the ''flame sensor''?
(''Two blue wires'' makes me think it is the hot surface ''glow plug itself''.)
When you were reading voltage at the ''flame sensor'' was the meter set to AC volts or DC Volts?
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