![]() ![]() X Air Temperature out of range in heating Bring return air temp within design parameters X Scaling in water heat exchanger Perform Scaling check and clean if necessary X X Unit Overcharged Check superheat and subcooling. ![]() Performance Troubleshooting Htg Clg Possible Cause Solution Insufficient capacity X X Dirty Filter Replace or clean Not cooling or heating properly X Reduced or no Air flow in heating Check for dirty air filter and clean or replace Check fan motor operation and airflow restrictions Too high of external static. The fan signal is usually passed to an external fan relay and the input is 24VAC and can be verified using a voltmeter. For example, between Y and C if the thermostat is sending an input to the compressor between G and C if the thermostat is sending an input to the blower between O and C if the thermostat is sending an input to the reversing valve for cooling between W and C if the thermostat is sending an input to the auxillery or emergency heat (heat strip) The compressor relay input is 24VAC and can be verified using a voltmeter. All inputs are 24VAC from the thermostat and can be verified using a volt meter between C and Y, G, O, W. If the thermostat is programmable, make sure it has fresh batteries.
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