Question about Ruud UBHC Air Conditioner

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Ruud heating/ac unit blowing only cold air in heating mode

Ruud model# URGG-07N48JKR mfd in 03/89 is blowing only cold air when in heat mode. Is this a single phase heat pump? I changed t-stat (Hunter model# 44360) and believe I wired correctly. 4 wires:
1) T1 to T1
2) G to G
3) RH and RC jumpered together
4) W1 on old t-stat to W/B on new t-stat

Switches on back set to HP(believing I have a heat pump) and HG (fan works fine in HG)

Still only cold air blows when in heat mode. Any advice??
thank you!

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Do you have gas or electric heat. If you have gas then you do not have a heat pump. You should in most cases have a red,yellow, white, and green wires coming to the thermostat. R should go to rc/rh G should go to green Y should go to Y and w should go to W. Also the switches on back should be switched to non heat pump and gas rather than electric. Hope this helps.

Posted on Feb 16, 2009

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