blown a fuse? Thermostat replacement problem - http://www.hvacmechanic.com/ Forums
Original message
| hitbyatrane
 |  "blown a fuse? Thermostat replacement problem"
, posted Tue 13 May 00:37  
Hey Guys
I've replaced my old Baystat 239 thermostat with a Honeywell RTH7400D. My system is a Trane XE1000 heat pump with a TWE042C140B1 Air Handler. I followed the manual line by line and used these wiring guidelines for a heat pump.
Old G goes to new G
Old Y goes to new Y
Old R goes to new R (R to RC jumper is in place)
Old O goes to new O/B
Old B goes to new C
Old W goes to new Aux
Old X2 goes to new E (X2 is em. heat)
Old T gets taped off
I set the system (code 0170) as heat pump with auxiliary backup (option 7). I set option 0190 to 0 and option 0240 to 9. The thermostat clicks periodically, so it is obviously doing something. But it is unable to activate the fan, cooling, or heating. I have doublechecked all wires. I'm not sure what to do next. Although I had the main 50 amp A/C breaker off the entire time, I saw a little discharge when handling the thermostat wires. Is it possible I blew a fuse somewhere? Any other ideas?
Your help is greatly appreciated. Thank God it's cool outside!
Adam
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Replies:
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| Houston204
| "Re(1):blown a fuse? Thermostat replacement p" , posted Tue 13 May 00:47:
You turned off the outdoor unit breaker instead of the air handler breaker.
Older models had
Newer models will have a blade type automotive fuse available at Autozone.
"Tip of the Day" Remember to remove power first.
[this message was edited by Houston204 on Tue 13 May 00:50] |
| | hitbyatrane
| "Re(2):blown a fuse? Thermostat replacement p" , posted Tue 13 May 01:42
I found the bad fuse on the air handler. Should be a simple fix. This time I'll turn off the heat strip breaker first.
Thank you for the help!!
Adam
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