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Re: Our central heating unit will come on and then off...
If it shuts down completely, it is probably a safety device. Doubt if it's the t'stat. This sounds like something is overheating and the safety is shutting down the unit. The safety could be the fan delay/limit switch. Also, there are usually several "Thermal Disc" type safety devices located near and around the heat exchanger. These can go bad. In other words, they can "Trip" at a temperature lower than the rated temp the devices is supposed to trip.
I would look here for you problem. Good Luck
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im guessing its there way of defrosting the coils , as with this type (small) its tough to defrost the coils in an efficient way , hp runs normal to within one or two degrees of setpoint , hp shuts off or reverses in low speed , back up heat comes on to complete the room heat and to generate the heat needed to defrost the coils , entire unit shuts off when set point is reached , reversing valves set for heat and wait till next cycle
now mine does something slightly different : it runs for fifteen minutes and if set point is not reached it switches to back up and reverses the coils ,leaves compressor on (low speed) , this heats the coils up and defrosts the outdoor unit , and if it runs long enough twenty minutes total time , it goes back to normal and aux heat shuts off . this drives me insane thinking how much im spending on heating the outside !! but im sure its needed to prevent ice build up on outdoor coils ,and I sure don't want that cracking with ice formations
I understand that the fan will not shut off on your Frigidaire air conditioning and heat, air conditioner, model# LRA18HMT2, even when you have turned your appliance completely off. I suggest resetting your appliance, by either unplugging it or shutting the power off at your home's circuit break, for 3-5 minutes. When power is restored, turn your air conditioner to any cycle and let it run for 5 minutes before turning it off. I ask that you please follow up with a comment on the post, at your convenience, to advise if further troubleshooting is needed or if your air conditioner status has changed successfully. Hope this is helpful.
The start capacitor may be the problem. Is your AC a central unit or window unit? Whats the model and make? If a window unit it could also be the thermostat is defective or too close to evaporator fins. Dirt on the condenser outside can cause the motor to heat up to the point it shuts down to cool the internal overload. Let me Know, Sea Breeze
Change your heating delay to shut off sooner, you can find this in the installation manual. Also the Thermostat may have delay after heat as well. It is true there could be many variables, but it also sounds like the Heatpump is not charged properly, you will have to have a different tech come out and check that. No need to have the installer mess your system up any further. This solution will only correct the auxilary heat, your heat pump on the other hand will require expert skills.
HELLO ... THERE IS A THERMOSTAT SENSING BULB THAT MAYBE OUT OF PLACE OR TOUCHING THE COIL. ALSO MAKE SURE YOUR CURTAINS ARE CLEAR FROM YOUR UNIT BY AT LEAST 3".
IF YOU CAN SEE THE REMOTE SENSING BULB OR ALUMINUM LINE, WARM IT UP WITH YOUR HAND AND SEE IF YOUR UNIT CONTINUES TO CYCLE OFF. IF IT DOES CHANCES ARE YOUR THERMOSTAT IS BAD. IT IS NOT EXPENSIXE ... UNDER $30.