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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Okay I've got a two ton heat pump about 15 years old can't

Customer Question

Okay I've got a two ton heat pump about 15 years old can't afford to replace it. I've just recently replaced the board, thermostat wire, the transformer, and the sensor in the back where the coils are. My fan still stays on even when the thermostat is set to off auto or when the green wire is unhooked. Had an incident with a weed eater and when the person hit it didn't let me know and fried almost everything. With my board being new, should I be having trouble of of a relay? I've already replaced the fan control sensor so I know it good.
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Let me see if I have a manual on the unit.Is air just room temp or slightly warm?

Customer: replied 1 year ago.
It's warmer than set on the thermostat. The heat works great, the fan just will not cut off unless you manually kill the breaker. The only thing I could think of would be a fan relay but it was replaced with the board, and the sensor (that opens and closes based on the heating elements whether the desired heat is is reached) has been replaced as well. I used to do heating and air before I joined the military but this has be completely baffled.
Expert:  airheatman replied 1 year ago.

Looking for a manual. I am wondering if perhaps a stuck sequencer.

Customer: replied 1 year ago.
Okay, let me know what you come up with because I've tried almost everything I've been able to come up with.
Expert:  airheatman replied 1 year ago.

Can you verify model is typed correctly NFCP3600C2

Customer: replied 1 year ago.
That's it.
Expert:  airheatman replied 1 year ago.

OK, Got it. Now if there is a heat kit, Can you give me that model,Something like AMFK1oCF or similar?

Customer: replied 1 year ago.
I'm not with it right now just have pics of the sticker with the model # ***** what it can have in it etc. I do not have the actual kit number in the system. Let me get home and I'll be able to give it to you.
Expert:  airheatman replied 1 year ago.

OK sounds good. Usually blower is energized through thermostat on Cool and Fan on mode, but through sequencer in heat mode.

Customer: replied 1 year ago.
Okay, thank you. The kit # ***** ***** Could you give me a part # ***** I could look it up and order it?
Expert:  airheatman replied 1 year ago.

Can you take a look in air handler and see if the wires from one of these relays also goes to fan?

Customer: replied 1 year ago.
Okay, I'll order it and get it overnight and get with you when it comes in.
Expert:  airheatman replied 1 year ago.

Sounds good,Hopefully will solve problem