Question about American Standard Heating & Cooling
When the thermostat's on cool, the unit comes on and the unit charges and the pipe on the unit gets hot then there is a clack every thing shuts down. also the defroster did not work last winter so we went to emergency heat to stop the Ice up. could you tell me the most likely problems
It sounds like a stuck reversing valve stuck in heating mode based on a hot refrigerant line.
It could be stuck in the heat position because it isn't receiving 24 volts to operate, or it could be stuck internally.
Tapping on the copper tubes on the reversing valve sometimes frees one that is stuck internally. It is copper so don't get carried away or you will destroy the reversing valve.
Did you feel the temperature of both copper lines?
If the reversing valve is stuck in heat, during the winter, your heat pump will ice up, because it isn't reversing to cool as it should when it calls for the defrost cycle to occur.
Google "heat pump reversing valve" to see what one looks like
You'll need to use a voltmeter to verify that the reversing valve is receiving twenty four volts.
Pull the two wires at the reversing valve coil and check for 24 volts.
If you don't have 24 volts there when you put the unit in cooling cycle,you either have defective thermostat wiring, or a defective thermostat.
If you have 24 volts you will need to check the electrical coil that the two wires plug into.
Set the voltmeter to ohms, and make contact with the meter leads onto the terminals of the coil. One lead goes on one terminal and one lead on the other terminal at the same time, to check for continuity. You should get an ohm reading. That means the coil is good.
If the meter indicates "0" ohms the coil is shorted and needs replacement.
If the meter doesn't read any ohms at all that means that the coil is burnt out and needs replacement
When the reversing valve is activated there will be a "whoosh" sound you can clearly hear if you are near the outdoor unit.
You can order the A/C parts you need online unless you have friend that is a HVAC tech and he could get one from the Trane supply house.
It is a big job to replace the reversing valve involving freon removal and brazing. Hopefully you will find the problem in the wiring, Thermostat, or the reversing valve coil.
Posted on May 19, 2014
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Posted on Jan 02, 2017
It's a defrost board issue. The timer on the board or something similar is hanging up. Unfortunately the solution is to replace the board. By lowering the temp. on the T-stat you are resetting the timer on the board. As you see that only works until the next cycle.
Posted on Feb 23, 2009
sounds like the coils inside the air handler/furnace are freezing up. likely cause is the freon charge is incorrect (probably undercharged). it may have been correct when the tech did the work but some may have leaked out. it is slightly possible too that the system is overcharged. you should have the system pressure verified, and then have it checked for leaks.
Posted on Jun 18, 2009
SOURCE: heat comes on with ac cooling
what type of unit do you have fleet wood monaco ? useually this is a bad ground problem in a trailor motor home useually low voltage dc problem
Posted on Aug 01, 2009
Hi, if this is a split system with a remote condenser It sounds as though you are having a problem with the thermostatic expansion valve on the heating cycle. If indeed this is a heat-pump, it has 2 metering devices that meter freon into the evaporator to heat or cool. The reversing valve changes the direction of the flow. If the condenser starts to ice up and shut down and repeat itself. I would say that is you're problem. This is something that would have to be changed by a service tech do to the equipment required to do this. I wish I could offer you a quick fix but I can not. You can let me know if this is a split system, and I may have other solutions for you, so get back to me on this please.
Posted on Dec 24, 2009
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