Our two year old Amana PTC153B50AJ a/c-heat pump started blowing cold air. On the front of the unit after removing the cover we found the message "Electric heater has a manual reset" but we've been unable to find it. Our service person is away for Thanksgiving holiday and it is becoming a real problem with outside temps at 32 or less. Can anyone help?? Thanks.
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the unit works by chilling air and the byproduct is heat in the compressor, this is used for heating in the winter and then reversed in summer to blow cold air. It has to blow cold and warm up before it can blow heat.
This is a heat pump so the problem could be anything related to the compressor, refrigerant circuit, etc. or the defrost control. There is usually a switch or screwdriver slot switch on the front of the unit when you take the large cover off. This will force the auxilliary heat on regardless of outdoor air temp, thus bypassing the compressor heat pump system (and costing you more to operate it.)
Heat pumps defrost which is the AC mode, if the heat strip isnt working during a defrost, the air will be cold, A heat pump only feels warm if the heat strips are on too! the refrigeration cycles heat output is much less sensible to our 98F skin. heat pumps that satisfy a room setpoint are working at least, all heat pumps feel drafty to most.
If this unit has the old style control with the knob instead of the digital control panel then I would suspect this first. This is the first component to fail on these units. I have replaced two already and the kit has good instructions and all components. Takes approximately an hour to do and mount the new sensors. (The transformer is hidden beneath the sheetmetal just below the control board). You should be able to order this kit through any appliance parts store for around 175 dollars versus almost 800 dollars for a new PTAC. Hope this is helpful.
Yes you could have a bad overload on the heater element which is fairly simple to fix. To test for this pull the heater out and get an ohmeter set it to continuity and check the continuity first through the entire heater element then if there is none pin point the overloads and check to see which one has no continuity.