Ohm meter reading to test thermocouple for carrier model 394jaw048080 ?
Great site!
I have a Carrier Model # 394JAW048080
The blower does not come on and after the pilot is lit (electronically) the main gas does not come on.
I previously had a tech come out and diagnose the thermocouple for temp overlimit a few years ago and I replaced the unit for $15 in 5 minutes.
Since he said they go bad more often than other parts, I focused on that this time.
When I disconnected a lead from the thermocouple, the blower came on, but the pilot went out. I figured that this must be the culprit since both the heater and pilot light were affected. I am guessing that the thermocouple needs to present a resistance greater than 0 for the blower to operate but not open for the burner to operate.
Is this correct?
I measured the resistance on the thermocouple and it was .5 ohms. (I used the 1 ohm scale.)
What should it be?
Also I noticed an in-line (resistor?) at the connection to the thermocoupler. I measured the resistance to that and it was 0 ohms. That seems weird. What should that be? Does anyone know the PN or rating of that so if I have to replace it I can get one at Radio Shack? It looks like something tha may not be at radio shack. Any suggestions as to a source?