calnart
Jan 14, 2007, 09:52 PM
Hi List,
I have a Rheem Criterion II model RGDG-05NAUER (w/ HONEYWELL Chronotherm III) that is acting up. Recently, it was having problem of maintaining the flame constant so I replaced the flame sensor that fixed the problem and now the flame stay lit but the heat sequence seemed to have messed up. I am trying to determine if the IFC is bad. Heating seems to be inconsistent - sometimes the furnace'd fired up and other times it won't.
Ok, when I power up the main power switch to the Rheem (I had to cut the main power because the blower kept on running and running and never shutoff after a heat cycle), I can hear the TS clicks to call the heat cycle then I will hear the inducer motor revv up and its fan spinned. About 10 sec into the sequence, I can hear a click sound on the IFC and the main blower kicked in blowing cold air. On the IFC, I can see the yellow flame sensor LED blinking (Other tow green LEDs are solid on). Most of the time when the main blower kicked in, the heat cycle won't start and the blower kept on running until I had to cut the main power from the main electrical switch again.
Sometimes, interestingly, even when my TS is at the OFF position, when I powered it up, the inducer blower will start and the main blower will kick in regardless.
Other times, IF I was lucky, after I've powered up the Rheem while the TS is in the OFF position, the heater will stay quiet. I'd wait about 10-20 sec to see whether the inducer/main blower will run or not. If after 20 sec or so and the darn thing is still sitting quiet, I'd throw the TS switch to the HEAT position and I'd hear a click sound on the TS as it calls for heat. Next, I'd hear the inducer revv up and if about 60 sec into the cycle and the main blower does not turn itself on, we will have the ignition sequence starts where the ignitor will glow and the burner nozzles will lite up.
If the heat sequence was successful, the temp will reach the desire setting and the burner will shutoff, however, the main blower will keep on running and running and running for hours without shutting ifself off. I had to cut the main power switch to shut the Rheem down. I had observed that even after the burner nozzles have shutoff, the yellow flame sensor still blinking as if it detects flame.
As a test, I've disconnected the G wire from the IFC and powered up the Rheem. Even with the G wire disconnected, the main blower still ran.
On top of one of the nozzles, I can what looks like another flame sensor about a size of a dime. It has a little protruding knob that I can turn it but can't push it in.
Also, right next to the inducer blower, there seems to be another sensor with two long shielded prongs that has something looks like a CMOS battery at the end.
I have gone over replaced 4 TS trial and the problem still exist - I don't believe it's the TS.
I'd grateful for any help anyone can provide - TIA.
I have a Rheem Criterion II model RGDG-05NAUER (w/ HONEYWELL Chronotherm III) that is acting up. Recently, it was having problem of maintaining the flame constant so I replaced the flame sensor that fixed the problem and now the flame stay lit but the heat sequence seemed to have messed up. I am trying to determine if the IFC is bad. Heating seems to be inconsistent - sometimes the furnace'd fired up and other times it won't.
Ok, when I power up the main power switch to the Rheem (I had to cut the main power because the blower kept on running and running and never shutoff after a heat cycle), I can hear the TS clicks to call the heat cycle then I will hear the inducer motor revv up and its fan spinned. About 10 sec into the sequence, I can hear a click sound on the IFC and the main blower kicked in blowing cold air. On the IFC, I can see the yellow flame sensor LED blinking (Other tow green LEDs are solid on). Most of the time when the main blower kicked in, the heat cycle won't start and the blower kept on running until I had to cut the main power from the main electrical switch again.
Sometimes, interestingly, even when my TS is at the OFF position, when I powered it up, the inducer blower will start and the main blower will kick in regardless.
Other times, IF I was lucky, after I've powered up the Rheem while the TS is in the OFF position, the heater will stay quiet. I'd wait about 10-20 sec to see whether the inducer/main blower will run or not. If after 20 sec or so and the darn thing is still sitting quiet, I'd throw the TS switch to the HEAT position and I'd hear a click sound on the TS as it calls for heat. Next, I'd hear the inducer revv up and if about 60 sec into the cycle and the main blower does not turn itself on, we will have the ignition sequence starts where the ignitor will glow and the burner nozzles will lite up.
If the heat sequence was successful, the temp will reach the desire setting and the burner will shutoff, however, the main blower will keep on running and running and running for hours without shutting ifself off. I had to cut the main power switch to shut the Rheem down. I had observed that even after the burner nozzles have shutoff, the yellow flame sensor still blinking as if it detects flame.
As a test, I've disconnected the G wire from the IFC and powered up the Rheem. Even with the G wire disconnected, the main blower still ran.
On top of one of the nozzles, I can what looks like another flame sensor about a size of a dime. It has a little protruding knob that I can turn it but can't push it in.
Also, right next to the inducer blower, there seems to be another sensor with two long shielded prongs that has something looks like a CMOS battery at the end.
I have gone over replaced 4 TS trial and the problem still exist - I don't believe it's the TS.
I'd grateful for any help anyone can provide - TIA.