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I'm on service with a commercial Carrier heat pump, It wont…

Customer Question
I'm on service with...

I'm on service with a commercial Carrier heat pump

Contractor's Assistant: Did you double-check the thermostat's settings? And what about the filters?

It wont shut off when reaching set temp

Contractor's Assistant: Do you plan on doing the work yourself?

Thats a service call

Contractor's Assistant: Anything else we should know to help you best?

Yes, I replace a new thermostat, new control board

Submitted: 8 months ago.Category: HVAC
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Answered in 3 minutes by:
12/18/2017
HVAC Technician: airheatman, HVAC Technician replied 8 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,366
Experience: Furnace, A/C and heat pump specialist.
Verified

1Mdel on Heat pump?

2.Model on thermostat

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Customer reply replied 8 months ago
Carrier 50TFQ009-521. Serial 2402G50779
Customer reply replied 8 months ago
TS Whiterodger, 2 stage heat
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

OK now when you say it will not shut off, Is Compressor and both fans continuing to run?

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Customer reply replied 8 months ago
system still running. The only way to turn it off is to turn off the power
HVAC Technician: airheatman, HVAC Technician replied 8 months ago

Lest eliminate thermostat being the issue,

Disconnect R ,Y1 and Y2 on unit control board from thermostat and see if unit stays on or goes off

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Customer reply replied 8 months ago
Still running, i replaced a new board and TS
Customer reply replied 8 months ago
I disconnected 1 by 1, then 3 at the same time, unit still running
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