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Check the exhaust port of the furnace. Wasps like to build nests in there and it will not allow the furnace to ignite if blocked. You have a gas detector and it is turned on I assume? I forgot this many times.
Toget proper heat, keep your temp setting at 30+ degree and also mode in "heat"position. If still no heat, check your heating sensor for closed circuit by anOHMs metre.It it's with RV, check power to RV.If it's with heatingelement check power to element. If power is there but still no heat meanselement defective. Replace new heating element. Thanks.
what kind of air con is it. it would be a sticky reversing valve either from inside the valve or the solinoid pulling it siting on the valve. http://t3.gstatic.com/images?q=tbn:SMSfcwrA_p4i6M:http://www.daviddarling.info/images/reversing_valve.jpg&t=1
I think you have a definite short and it's in the 24 volt circuit. The only problem is - 'finding a low voltage short' is not the easiest thing in the world to do - so - I would guess you'd need a Service Tech.
CHECK FOR ELECTRICAL POWER @ l1 CONNECTION,IF YOU HAVE NO POWER CHCK THE FUSE,AND INSURE THE THERMOSTAT IS SET FOR COOLING OPERATION. IF THE UNIT HAS LEAKED FREON, A LOW PRESSURE SWITCH HAS OPENED, PREVENTING THE UNIT FROM OPERATING TO PREVENT DAMAGE TO THE COMPRESSOR. DO YOU HAVE A MANIFOLD GAUGE, AND ARE YOU CERTIFIED TO WORK WITH REFRIGERANTS? IF YOU ARE IN COMPLIANCE,HAVE TOOLS AND TEST EQUIPMENT WE CAN PROCEED FURTHER.
You may have to remove your filter & look for a model # of your unit, so we can pinpoint your wiring to the thermostat. Usually the terminals on the thermostats are labeled -RC-RH- etc, and you simply move old to new of the same. A lot of times some manufacturers will use phone cable form AC unit to thermostat, and mix up the colors, that's the reason for going to the AC and see what color is used from there. It could be red from control box, connected to green wire to thermostat for example. Thats where you note it and wire accordingly.(terminal calling for red wire, would now be green) If your stumped, get back to us with that model#.