Furnace runs for 8 minutes at a time.
This is driving me nuts. For the past few months, my furnace has adopted this annoying feature in that it only runs for eight minutes at a time. To make it run more, you have to turn the thermostat DOWN (where it will then make that "click" sound) and then back up, or turn it off and back on. If you leave it alone, it will come back on in one hour and run for another eight minutes.
The furnace is a Suburban NP-30 if I remember the model correctly. Over the last 2-1/2 years it's been totally rebuilt. It has a new thermostat, new board (Dinosaur board), new sail switch, new motor, and new gas valve. Oh and a new limit switch.
A friend who works on RVs first said it's probably the limit switch. So at his recommendation, I removed it and jumpered across it to eliminate that as a possibility. Nope, didn't fix anything.
Next, we replaced the circuit board again... it already had a Dinosaur board, and that board even passed his board tester, but we put a new one in it just because. Again, no change.
Yesterday, I replaced the wall thermostat. And, still no change.
I'm running out of ideas... so thought I'd post here. I'm leaving for a trip in less than a week and I'll be dry camping for two weeks... I sure would like to have a working furnace!!
Rob
The furnace is a Suburban NP-30 if I remember the model correctly. Over the last 2-1/2 years it's been totally rebuilt. It has a new thermostat, new board (Dinosaur board), new sail switch, new motor, and new gas valve. Oh and a new limit switch.
A friend who works on RVs first said it's probably the limit switch. So at his recommendation, I removed it and jumpered across it to eliminate that as a possibility. Nope, didn't fix anything.
Next, we replaced the circuit board again... it already had a Dinosaur board, and that board even passed his board tester, but we put a new one in it just because. Again, no change.
Yesterday, I replaced the wall thermostat. And, still no change.
I'm running out of ideas... so thought I'd post here. I'm leaving for a trip in less than a week and I'll be dry camping for two weeks... I sure would like to have a working furnace!!
Rob
