I have a Trinity T200 that has been running for 10 years without issue. Since the end of summer last year, it started to throw ASC code and would not start the flame (of course). I have since found out the following symptom:
1) following other suggestions from googling around, if I blow air into the sensor, it would start again; but that means I have to blow it all the time
2) in summer, if I take the front cover off the unit, it would not give the ASC error code and run no problem; the problem comes back as soon as I put the front cover back on; this has been re-validated this summer again;
3) in winter, there would be no issue even with the cover on; however when it turns to summer (or close to summer), the problem comes back.
I hope I have explained my case. I have no knowledge of heating/cooling system. But with the above information, I am attempted to think the Normally Close Pressure Switch is malfunctioning.
Could someone give me some insight to this?
Thanks in advance.