Posted by MarkB_MI on December 21, 2022 at 04:15:40 from (174.240.150.243):
In Reply to: Furnace posted by rlp in Co. on December 20, 2022 at 22:49:57:
What sort of meter are you using? A digital multimeter should have a high enough input impedance that it won't effect the furnace circuitry. But an analog meter or a very crappy digital meter could. Another possibility is your meter probes are causing something to contact that otherwise is open.
What kind of flame sensor is it? If it's just a steel electrode, clean it up with sandpaper and it will probably work. If it's an optical sensor, wipe the dust off its lens.
It is ridiculous to wait nearly a month for an igniter and flame sensor. Find another source that has them in stock. You can keep the ones you've already ordered as spares. I've had very good luck ordering furnace parts from both supplyhouse.com and repairclinic.com.
The flame sensor problem is most likely a coincidence. You probably would have had to fix it even if the transformer hadn't blown out.
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