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Re: heat not blowing on heat cycle
Have to know what kind of heat it is, Gas, Electric or Electric Heat Pump.
Heat pumps, when air over air type, have an extra setting on the thermostat labeled Emergency Heat, Although these thermostats can work on the other types of heating as well.
Both modern Gas and electric furnaces have the blower controlled by a blower board. The flame and or heating elements can also be controlled by the same or a separate board. SO you could have a board problem, or a safety switch or other symptom causing a safety switch to trip off on you.
Consult with your diagram and find something you can recognize then trace the wires down and follow to where you get the power to turn on the heat (usually always R feeds thermostat and W feeds Heat). Colors of the attached wires means nothing at this point. Look for the terminal designations not colors.
Hope this helps you. Please grade me accordingly and GOOD LUCK. :)
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if the fan switch is in the Run position and not the auto position you are getting cool are when the heat element is not on. this is kind of like a way to circulate the air. look for an auto setting it then should only come on when needed. Keep in mind it is normal for the fan to start blowing before the heating element is warmed up, this prevents it from over heating, or coming on when the fan is not working
At your thermostat , Set switch to heat, turn up temp switch. Fan should be set to auto. Wait up to 5 mins to be surethat somthing is wrong. If your fan comes on without heat. Check gas valve or if heat pump check main a/c breaker. If elect heat or any of above dosn't work. Call a service company. If your in Pensacola. Look up Absolute Heating and Air Conditioning.
you may want to check and see if the cycling switch is defective...it engages and disengages the clutch on the compressor ..i would check and see if the clutch stops engaging when the a/c starts blowing warm
If you are referring to the outside unit freezing up, the issue is in the defrost cycle. The defrost cycle works something like this: The unit reverses the flow of freon causing the inside coil to blow cold air into the conditioned space and the outside coil is now working like an a/c unit, it gets warm to melt the frost/ice. The inside unit electric heat strips come on so you do not notice the cold air being blown in. The fan on the outside unit stops running to allow the coil to get good and warm.
Now the unit should go into the defrost cycle every 90 minutes or so. It should not terminate the cycle untill the coil is clear of frost. There is an "Klixon" type termostat that measures the temperature of the outside coil. This is most likely the problem. It is prematurely terminating the defrost cycle. I'd start there first.
Hope this helps, Let me know if I can be of any further help.
ok if unit is split system two piece check to see if out door unit is running fan and compressor the air coming out of the fan should be about 20 deg warmer than out door temp if not compressor not running check the capicitor to see if swelled up on top if so bad if unit has electric heat strip a heat relay may be stuck and you are running aug heat to check this pull disconect on out door unit and see if heat is out of vents if heat pump reversing valve may be bad hope this helps
69,000 btuh is adequate for a 12-1400 square foot house.
Otherwise, your thermostat simply tells the furnace to cycle on/off.
If it calls for heat and does not come on, the problem is with switches and relays within the furnace.
Your setting the temp higher only causes the other parts to keep trying until they finally light and heat.
This is based on your information saying it will cycle on and blow cool air--not hot air.
You will have several temperature variations from floor to ceiling.
You probably have ceiling vents as well.
You need a technician to verify the rollout switches, fan relay, inducer fan etc. if the furnace is not firing everytime you call for heat.