We have two HVAC units, an upstairs unit and downstairs unit. The upstairs unit, which is a heat pump, is rarely used. It is mostly set to off because we rarely use the upstairs living space. I have recently encountered a problem with the upstairs unit and am hoping to get some insight into what could possibly be causing the problem.
No matter what the thermostat is set on (heat or cool), it cuts on for about 2 seconds then immediately cuts the unit off. We have the same thermostat upstairs and downstairs. We took the front off the thermostat upstairs and tried it downstairs. It appears to work correctly on the unit downstairs.
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The thermostat is turning the unit on, then the unit is turning itself off two seconds later. This is indicative of a unit that is recognizing there is a problem and shutting itself off to prevent any damage to the compressor.
In most cases when this sequence of events occurs, the low pressure safety switch on the heat pump is shutting the unit down due to a low pressure on the low side of the refrigerant system. This is typically due to a loss of refrigerant.
I would recommend a HVAC professional diagnose the unit and if you do have a refrigerant leak, having the leak repaired.
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I have central heat and air. I had to reset the breaker for the furnace today. The heater never comes on in auto mode. I have a digital thermostat. I have also reset the breakers on the furnace itself. The blower will come on with it in manual. Why is my home heat blowing cold air only? Any help would be nice.
Several possible things could be the cause of your home heat blowing cold air only. If your fan motor is not coming on when the thermostat is on the call for heat with the fan setting on auto, this could be caused by several issues.
One: The thermostat could be faulty.
Two: You have a break in the low voltage heat wire (white) from the thermostat to the furnace.
Three: Heat/fan relay at the furnace could be faulty.
With your furnace tripping breakers scenarios one and two are both unlikely. I would suspect that the heat/fan relay is not turning on the fan but is energizing the heat causing an overdraw of current, which in turn is causing the tripping of the breakers.
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Call 251-610-2848 to schedule a service appointment with one of our highly qualified HVAC professionals. We provide quality service to customers in Fairhope, Daphne, Spanish Fort, Foley and surrounding areas in Alabama.