Heat Controller HEV/H Functional Troubleshooting Cont, Hev/H Series, Heat Controller, Inc, Fault

Heat Controller, Inc. HEV/H SERIES Installation, Operation & Maintenance

FUNCTIONAL TROUBLESHOOTING (CONT.)

Fault	Htg Clg		Possible Cause	Solution
IFC Fault Code 13	X	X	No pump output signal	Check DC voltage between A02 and GND - should be
Internal Flow				between 0.5 and 10 VDC with pump active
Controller Fault			Low pump voltage	Check line voltage to the pump
			No pump feedback signal	Check DC voltage between T1 and GND. Voltage should
				be between 3 and 4 VDC with pump OFF, and between
				0 and 2 VDC with the pump ON
			Bad pump RPM sensor	Replace pump if the line voltage and control signals are
				present at the pump, and the pump does not operate
ESD - ERV Fault (DXM Only)	X	X	ERV unit has fault	Troubleshoot ERV unit fault
Green Status LED Code 3			(Rooftop units only)
No Fault Code Shown	X	X	No compressor operation	See 'Only Fan Operates'
	X	X	Compressor overload	Check and replace if necessary
	X	X	Control board	Reset power and check operation
	X	X	Dirty air filter	Check and clean air filte r
	X	X	Unit in 'Test Mode'	Reset power or wait 20 minutes for auto exit
Unit Short Cycles	X	X	Unit selection	Unit may be oversized for space - check sizing for actual
				load of space
	X	X	Compressor overload	Check and replace if necessary
	X	X	Thermostat position	Insure thermostat set for heating or cooling operation
	X	X	Unit locked out	Check for lockout codes - reset power
Only Fan Runs
	X	X	Compressor overload	Check compressor overload - replace if necessary
	X	X	Thermostat wiring	Check thermostat wiring at DXM2 - put in Test Mode and
				jumper Y1 and R to give call for compressor

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