My induction blower never stops. It was showing a code of pressure switch but if I turned off the main power and then back on it would reset and heat normally till it was up to temp then shut off and do it again. If I unhooked the vacuum hose while it was running the flame would go out and the furnace blower would stop (not the induction blower) then when I hooked it back up it would start normally so I know the switch is good there is no problem with that. Th induction blower was replaced 3 months ago and has worked normally till now. The control board is also new.

It's a Heil H8MPN100J20A1 furnace about 10 years old.

  • I wonder if it is a clogged pressure port: youtube.com/watch?v=a_BGCsv76ac
    – chili555
    Commented Jan 22, 2019 at 23:40
  • The air handler stops if you break the safety chain? That sounds odd. What if the high temp limit tripped... it's supposed to keep running the handler... - Is there another pressure switch somewhere?
    – Mazura
    Commented Jan 23, 2019 at 2:27

1 Answer 1


If it's an old York, that is your error code. Verify all limit switches, or find the reason they're tripping.

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