Hello,
I have a Mastertemp 125 heater (3 yrs old) that stopped working about 3 weeks ago. It worked fine until then and now it won't fire. No diagnostic LED's. The blower comes on, I can smell gas, lots of clicking noises but it never fires (goes through 2 cycles) and then I get the 3 flashes from the ICM for ignition lock-out. I replaced the HSI, no change. I had a Tech out and he diagnosed that I had a bad gas control valve. I replaced the gas control valve - no change. For fun I replaced the stack flue sensor; again no improvement. I went through the troubleshooting manual and I have 18 VAC to the igniter, which I assume is OK since all it says is anything but 0 or 120V (120V system) is OK. Help!
I have a Mastertemp 125 heater (3 yrs old) that stopped working about 3 weeks ago. It worked fine until then and now it won't fire. No diagnostic LED's. The blower comes on, I can smell gas, lots of clicking noises but it never fires (goes through 2 cycles) and then I get the 3 flashes from the ICM for ignition lock-out. I replaced the HSI, no change. I had a Tech out and he diagnosed that I had a bad gas control valve. I replaced the gas control valve - no change. For fun I replaced the stack flue sensor; again no improvement. I went through the troubleshooting manual and I have 18 VAC to the igniter, which I assume is OK since all it says is anything but 0 or 120V (120V system) is OK. Help!