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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 7596
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Have a Trane PTAC and the digital control is randomly

Customer Question

Have a Trane PTAC and the digital control is randomly blinking on and off.
Submitted: 4 months ago.
Category: HVAC
Expert:  Phil replied 4 months ago.

Hello, I hate to be too brief, but those symptoms point almost exclusively to bad printed circuit card.

We can do a heat stress on it

Use a hair drier to slowly warm the printed circuit card up to120F or a bit warmer, but not over 140F... if there is any change in the error codes or other furnace behavior... the card has a cracked micro circuit that opens and closes as the card expands and contracts... that proves a bad printed circuit card.

No change however does not prove the card is good however... but a change proves the card is definitely bad.

Let me know what you can discover. we can go from there.