Can't Find Fuse... Please Help!!! - HVAC - DIY Chatroom Home Improvement Forum

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Old 01-03-2007, 03:42 PM   #1
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Can't find fuse... Please help!!!

I have a Comfortmaker heat pump. I was replacing the old thermostat with a 7 day programmable Hunter. After I hooked it up, it operated fine. However, when it would move from one setting 65 degrees to another setting 75 degrees it would kick in my emergency heat instead of gradually increasing so that the heat pump could do the work. I did not like this, so I tried wiring it differently.
After I done this, I lost power to my thermostat wiring. I put the old thermostat back on to verify that is was not my thermostat. I also used a voltage tester and found that there was no power to the thermostat. I have searched for a blown fuse but cannot find a fuse in the unit.
Where do I find the fuse on this type of unit? Is it in the furnace wiring, fan wiring, heat pump wiring? I have checked the breaker and it is not tripped. I am not very familiar with HVAC, but I am fairly sure that it is just a fuse but I cannot find any.


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Old 01-03-2007, 05:20 PM   #2
Thoroughbred Mopar Man
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Hi keithstef2005

Shut the power off to the furnace and remove the blower door. You should see a circuit board inside the blower compartment. On this board should be either a 3 or a 5 amp ATO blade type fuse. Take that Hunter stat back to Wal-Mart, get your money back. Go to a HVAC supply house and pick up a White Rodgers 1F89-211 and save yourself a ton of headaches.

Good luck


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Old 01-03-2007, 06:10 PM   #3
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Hunter makes the worst thermostats in the world.You couldnt give me one of those.white rodgers is much better and reliable.
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Old 01-03-2007, 10:21 PM   #4
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If I have to pick, I'll go with Honeywell everytime. A little more expensive, but you get what you pay for!!
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