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Functional Troubleshooting
Fault
Unit Does Not Operate
Fault
in Cooling
Unit Does Not Operate
in Cooling
Performance Troubleshooting
Performance
Troubleshooting
Performance
Insufficient Capacity/
Troubleshooting
Not Cooling or Heating
Insufficient Capacity/
Properly
Not Cooling or Heating
Properly
FUNCTIONAL TROUBLESHOOTING
HTV/HTD/HTH SERIES
FUNCTIONAL TROUBLESHOOTING
Htg
Clg
Possible Cause
X
Reversing Valve
Htg
Clg
Possible Cause
X
Reversing Valve
X
Thermostat Set-up
X
Thermostat Wiring
X
Thermostat Set-up
X
Thermostat Wiring
X
Thermostat Wiring
X
Thermostat Wiring
PERFORMANCE TROUBLESHOOTING
PERFORMANCE TROUBLESHOOTING
Htg
Clg
Possible Cause
Htg
Clg
Possible Cause
X
X
Dirty Filter
X
Reduced or No Air Flow in Heating
X
X
Dirty Filter
X
Reduced or No Air Flow in Heating
X
Reduced or No Air Flow in Cooling
X
Reduced or No Air Flow in Cooling
X
X
Leaky Duct Work
X
X
Leaky Duct Work
X
X
Low Refrigerant Charge
X
X
Restricted metering device
X
X
Low Refrigerant Charge
X
Defective Reversing Valve
X
X
Restricted metering device
X
X
Thermostat Improperly Located
X
Defective Reversing Valve
X
X
Unit Undersized
X
X
Thermostat Improperly Located
X
X
Unit Undersized
X
X
Scaling in Water Heat Exchanger
X
X
Inlet Water Too Hot or Cold
X
X
Scaling in Water Heat Exchanger
X
X
Inlet Water Too Hot or Cold
Set for cooling demand and check 24 VAC on RV
CXM board
Set for cooling demand and check 24 VAC on RV
If RV is stuck, run high pressure up by reducing and
CXM board
while operating engage and disengage RV to push
If RV is stuck, run high pressure up by reducing and
valve
while operating engage and disengage RV to push
Check for 'O' RV set-up not 'B'
valve
Check O wiring at heat pump. Jumper O and R
Check for 'O' RV set-up not 'B'
'Click'
Check O wiring at heat pump. Jumper O and R
Put thermostat in cooling mode. Check for 24 (check
'Click'
between C and O); check for 24 VAC on W between W
Put thermostat in cooling mode. Check for 24 (check
and C). There should be voltage on W. If voltage is
between C and O); check for 24 VAC on W between W
present on W, thermostat or wired incorrectly
and C). There should be voltage on W. If voltage is
present on W, thermostat or wired incorrectly
Replace or clean
Check for dirty air filter and clean or replace
Replace or clean
Check fan motor operation and airflow restriction
Check for dirty air filter and clean or replace
Too high of external static. Check static valve
Check fan motor operation and airflow restriction
Check for dirty air filter and clean or replace
Too high of external static. Check static valve
Check fan motor operation and airflow restriction
Check for dirty air filter and clean or replace
Too high of external static. Check static valve
Check fan motor operation and airflow restriction
Check supply and return air temperatures at two
Too high of external static. Check static valve
distant duct registers if significantly different ,
Check supply and return air temperatures at two
restrictions are present
distant duct registers if significantly different ,
Check superheat and subcooling per chart
restrictions are present
Check superheat and subcooling per chart
Check superheat and subcooling per chart
Perform RV touch test
Check superheat and subcooling per chart
Check location and for air drafts behind stat
Perform RV touch test
Recheck loads & sizing check sensible clg load vs.
Check location and for air drafts behind stat
heat pump capacity
Recheck loads & sizing check sensible clg load vs.
Perform scaling check and clean if necessary
heat pump capacity
Check load, loop sizing, loop backfill, ground
Perform scaling check and clean if necessary
Check load, loop sizing, loop backfill, ground
44
44
47
Heat Controller, Inc.
Solution
Solution
Solution
Solution
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Table of Contents
Troubleshooting
