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-   -   Trane XE 1100 no heat only AC works. (

aderhojl 02-11-2012 09:51 PM

Trane XE 1100 no heat only AC works.
I have a Trane XE 1100 The compressor and fan outside will not come on in heat mode but will in AC mode. Does anyone know what I could try. I replaced the thermostat and it didn't work.

biggles 02-12-2012 06:46 AM

check for a transformer out within the condenser

Tator1076 02-12-2012 08:53 AM

It can be a lot of then's. It can be t stat, outdoor control defrost board, low pressure switch or It can just be too cold and h.p lock out due to low temp outside

hvactech126 02-12-2012 10:58 AM

If it works in a/c mode and not heating, then you need to verify you are getting the proper signal outside in heating mode. Check for 24V between Y and C at the outdoor unit with a call for heat.

thermal-medics 02-12-2012 11:42 AM

Service lately
Just curious: Split system or package heat pump (all on roof)? When you ask for heat at the T-stat (new or old) did the blower motor operate (air from vents)? Did you have the unit serviced lately? Did it run in heat mode up until now with no problems? Did you run it in heat mode during a warm day? It is 78 in Phoenix today.. we desert rats are whimpy..

Keeping it simple, does the defrost control board (circuit board inside outdoor unit have a blinking light you can code match to the manual)?

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