My furnace was throwing a trouble code. The code was 31 and for my manufacturer (Bryant) and others thats is a pressure switch code. I was able to resolve this code and get my heat back on simply by working through the troubleshooting steps not by changing or replacing parts or removing blockages.
Steps I took to find the problem:
- Smelled and felt for gas leaks FIRST
- Took off furnace cover and observed blinking-light trouble code, 3 short 1 long, sticker on the cover says thats a pressure switch
- Power cycled furnace
- Replaced filter
- Checked outside vent and intake for blockage, felt good airflow through both
- Checked drain hoses and pipes for kinks and blockage, flexible pipes inside furnace were bent around a bit but not kinked
- Observed burner through observation window, saw pilot ignite, saw main burner fire up
Through the course of trying to discover the problem the furnace came back on normally. I do not like "it just started working again" fixes, something was wrong and may still be wrong and I want it properly fixed not luckily fixed!
What should I monitor over the next few hours or days to ensure that the problem stays fixed?
Are there any parts I should replace as preventative maintenance for this trouble code?
Any actions I should take as preventative maintenance for this trouble code?
Are there any tests or measurements I can take? Voltages? Pressures in the exhaust/intakes?