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Re: condensing unit won't start
YOU CAN HAVE 120 ON EACH LEG WITHOUT HAVING 240 ACROSS CHECK ACROSS BOLTH LEGS.IF YOU HAVE 240 YOU PROBABLY HAVE A SAFETY HOLDING IT OUT.TRACE THE POWER FROM THE CONTACTOR THREW THE BOARD BY HOLDING ONE METER LEG ON COMMON AND WALKING THREW THE CIRCUIT WITH THE OTHER LEG.
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No the fan out side is for a condensing unit and compressor. The compressor should not run with the heat. I am almost positive that if this is not a heat pump that the compressor unit should not be running.
It may be wired incorrectly. Make sure that the compressor is being called to run when you set the ac to cool. The Green wire to T-stat makes the indoor fan run when you set the T-stat to cool...also the Yellow wire should signal the contactor to engage at the outside condenser and compressor unit. If this is a heat pump system there is usually an orange wire that will signal the reversing valve to move when cool is being called....normally the reversing valve is in the heating position in the event there is a failure to the solenoid that actuates it..thus leaving it to fail in the heat mode to provide heat in winter weather as a default. Make sure the new T-stat accomidates for your units wiring.
Red wire to R (24v supply from transformer)
Green wire to G (indoor fan)
White wire to W (call for heat)
Yellow wire to Y (call for cool)
Blue or Black wire to C (common)
Orange also to Y if not specific to t-stat (calls for reverseing valve in cooling mode)
Does the indoor fan run? Place the fan switch in run. If it doesn't run then the transformer could be bad. Also, there could possibly be some high and low pressure switches that would keep you from getting the 24vac to the contactor. First rule out the thermostat by removing the face and installing a jumper wire between the R and Y terminals. This should make the outside unit run. If it does then your thermostat is not passing 24vac to the unit and should be replaced. If it doesn't run with the jumper in, then your problem is in the outside unit. Trace out the yellow wire from the thermostat in the outside unit and check the components that the wire goes through (high and low pressure switches). Let me know what you find so I can offer more help if needed.
check for manual reset switches around burner area. These switches will have two wires going to them and a little button in the middle of the switch. You might hear a little click if they were tripped.
Do you have central air? If so put the fan on auto turn AC to lowest setting fan should come on in a minute if not go outside to your condenser unit check for ice building up on the compressor or any of the copper lines if it is you need refrigerant. If not you may need to blow out the condenser with an air compressor or shut off power hose it out. Also, look for broken wires. If all else fails call your local service Provider.
hire an electrician. period you may need to have a larger wire and larger breaker installed..
do not attempt to do it yourself unless you are a licensed journeyman electrician.. the problem is prolly fairly serious.
make sure if wire and breaker are replaced that the person who does it pulls a permit period..
Check contactor on outside unit for burned contacts. Try to manually press the contactor with INSULATED screwdriver to test. Should be some **** on cotact buttons. Hope this helps. Let me know. Good luck