Original message
| brian19622001
 |  "Armstrong Ultra SX 90 and Concept 10 heat pum"
, posted Fri 17 Oct 11:06  
Armstrong Ultra SX 90 propane furnace model # GH90A075D141A Serial # 8498A32067 and Armstrong Concept 10 heat pump model SHP10C36A-3B Serial # 8497C35941 The blower control board has been replaced the unit works normally in the cooling function during the heating function the heat pump is to heat the house when the outside temp is 35 or above. the last few mornings the outside temp has been 45-49 the heat pump will come on run for 60 to 90 seconds and the go off and Aux (furnace) comes on on the second cycle the heat pump came on and stayed on for whole cycle brought house up to temp and shut off. third cycle it did same as 1st cycle heat pump for 60 to 90 seconds then Aux heat. it has never done this before. had updated blower contol board installed the system uses the fossil fuel kit and there is a thermostat on the outdoor heat pump. I'm thinking maybe its the thermostat on the outdoor unit might be bad. any help you folks can give would be greatly appricated
Thanks
Brian
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