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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I'm having an issue with my Trane Xr11 heat pump. At first,

Customer Question

I'm having an issue with my Trane Xr11 heat pump. At first, I had the issue of the fan not spinning, but hearing a hum. I diagnosed that as a capacitor issue and replace it. It worked fine for a week.
Now, I have a blank display on the thermostat. Checking the contacter block on the outside unit, I get 240 volts on the lower (input side I believe) and zero volts on the upper..the terminals past the coil. If I manually push in that contact button, the fan kicks on.
The coil block, control board? What can it be
Submitted: 2 years ago.
Category: HVAC
Expert:  Brian HVAC Guy replied 2 years ago.
Hi, I'm Brian and I'm here to help!
The most common cause for this is the low voltage fuse in the air handler (indoor unit) has blown for some reason. If you remove the blower panel on your air handler (or furnace on a dual fuel system) you should look for a circuit board that will have an automotive style fuse (usually a purple 3 amp fuse but could be a yellow 5 amp) on it. Pull that fuse out and see if the link inside is blown or check it with an ohmmeter.
We can go from there...
Thanks, -Brian
Customer: replied 2 years ago.
ok, thanks Brian. I'll have to check that probably in the morning.Ken
Expert:  Brian HVAC Guy replied 2 years ago.
Very good Ken, let me know what you find and I'll help any way I can!

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