WARNING:
Turn OFF Propane supply before doing anything.
Repeat, Turn OFF Propane supply before doing anything.
Refer to fig 7.
There are 2 paths for current to flow. One is to the Time delay relay/fan motor, the other to the sail switch/module board. While operation of the sail switch/module board circuit will not affect operation of the Time delay relay/fan motor circuit, the Time delay relay/fan motor will affect operation of the sail switch/module board circuit. The sail switch is used to detect that the fan is running at speed therefore it will not turn on if the fan motor is not running. (As a side note, low 12VDC results in a reduction of fan speed which can result in the sail switch turning off) Anyway, you want to first concentrate on getting the fan motor to run.
Refer to fig 5 (Cannot read wire color on this small drawing so have to just refer to points)
There are 4 wires coming to the furnace.
From fuse panel: B+ and GND
To/From Thermostat: B+ to thermostat, B+ signal from thermostat that tells the furnace to turn ON.
1) Verify B+ from the fuse panel is at the Time delay relay. (black lead of voltmeter/test light connected to GND). If not there then problem is between fuse panel and furnace.
2) Turn Thermostat ON and verify B+ signal from Thermostat is at Time delay relay. If not there, thermostat is bad.
3) With Thermostat ON, verify B+ is at Fan supply terminal. If it is there, then the fan is bad. If not there, Time delay relay is bad.
Until this part of the circuit is working, there is no use taking this trail any furthur as no fan means sail switch will never work.
Good Luck,
Dave
I followed the instructions and checked fuse's and I did not get any results with an ignighter or fan comming on. Any idea's. Thanks.
Linear Mode
