I have 2 Carrier 58RAVQ35 units which were installed in 1992. These units were never serviced over the years which may be catching up with me now.
Recently, the upstairs unit started failing intermittently (no heat). The failure usually occured at night when it got cold. The service guy came and didn't see the problem so he replaced the board and said if that doesn't fix it I'll need a new unit. After about a 2 weeks of working, the unit started failing intermittently again so I decided to take a look at it myself. The current state of the unit is that I am seeing LED code 14 (Ignition lockout). I see the ignitor glow red hot, I see 24Vac at the gas value but no flame starts. I have swapped parts (flame sensor and cleaned both, ignitor, presure value) between my working and failing units and the failure still occurs on the same unit (but still somewhat intermittent). I'm guessing it's the gas value but it's not too cold down south so I have time to play since the down stairs unit still works. Questions:
1) What else could I do to isolate the problem further?
2) Could a sensor block the gas from coming on even if 24VAC is seen at the value terminals?
2) Is the gas value something a DIYer could do? I'm pretty handy (plumbing with copper pipes, hardwood floors, tiles, etc.) but never did anything with gas lines.
3) Should I bite the bullet and buy a new unit?
Thanks for your help.
Recently, the upstairs unit started failing intermittently (no heat). The failure usually occured at night when it got cold. The service guy came and didn't see the problem so he replaced the board and said if that doesn't fix it I'll need a new unit. After about a 2 weeks of working, the unit started failing intermittently again so I decided to take a look at it myself. The current state of the unit is that I am seeing LED code 14 (Ignition lockout). I see the ignitor glow red hot, I see 24Vac at the gas value but no flame starts. I have swapped parts (flame sensor and cleaned both, ignitor, presure value) between my working and failing units and the failure still occurs on the same unit (but still somewhat intermittent). I'm guessing it's the gas value but it's not too cold down south so I have time to play since the down stairs unit still works. Questions:
1) What else could I do to isolate the problem further?
2) Could a sensor block the gas from coming on even if 24VAC is seen at the value terminals?
2) Is the gas value something a DIYer could do? I'm pretty handy (plumbing with copper pipes, hardwood floors, tiles, etc.) but never did anything with gas lines.
3) Should I bite the bullet and buy a new unit?
Thanks for your help.