Functional Troubleshooting - Heat Controller HBH Series Installation, Operation & Maintenance Manual

Heat Controller, Inc.

Functional Troubleshooting

Fault Htg Clg Possible Cause
Main power Problems X
HP Fault-Code 2
High pressure
X
X
X
X
LP/LOC Fault-Code 3 X
Low Pressure/Loss of Charge X
FP1 Fault - Code 4 X
Water Coil low
temperature limit
X
X
X
X
FP2 fault - Code 5
Air Coil low
temperature limit
X
Condensate Fault-Code 6
X
X
X
X
Over/Under Voltage-
X
Code 7
(Auto resetting)
X
X
Unit Performance
Sentinel-Code 8
No Fault Code Shown X
X
X
Unit Short Cycles
X
X
X
X
X
Only Fan Runs
X
X
X
Solution
X Green Status LED Off Check Line Voltage circuit breaker and disconnect
Check for line voltage between L1 and L2 on the contactor
Check for 24VAC between R and C on CXM/DXM
Check primary/secondary voltage on transformer
X Reduced or no water flow Check pump operation or valve operation/setting
in cooling
Check water flow adjust to proper flow rate
X
Water Temperature out of range in
Bring water temp within design parameters
cooling
Reduced or no Air flow Check for dirty air filter and clean or replace
in heating Check fan motor operation and airflow restrictions
Dirty Air Coil- construction dust etc.
Too high of external static. Check static vs blower table
Air Temperature out of range in
Bring return air temp within design parameters
heating
X
Check superheat/subcooling vs typical operating condition
Overcharged with refrigerant
table
X
Bad HP Switch Check switch continuity and operation. Replace
X Insufficient charge Check for refrigerant leaks
Compressor pump down at start-
Check charge and start-up water flow
up
Reduced or no water flow Check pump operation or water valve operation/setting
in heating Plugged strainer or filter. Clean or replace.
Check water flow adjust to proper flow rate
Inadequate anti-freeze level Check antifreeze density with hydrometer
Improper temperature limit setting
Clip JW3 jumper for antifreeze (10°F [-12°C]) use
(30°F vs 10°F [-1°C vs -12°C])
Water Temperature out of range Bring water temp within design parameters
X Bad thermistor Check temp and impedance correlation per chart
X Reduced or no Air flow Check for dirty air filter and clean or replace
in cooling Check fan motor operation and airflow restrictions
Too high of external static. Check static vs blower table
Too much cold vent air? Bring entering air temp within
X Air Temperature out of range
design parameters
Improper temperature limit setting
X Normal airside applications will require 30°F [-1°C] only
(30°F vs 10°F [-1°C vs -12°C])
X Bad thermistor Check temp and impedance correlation per chart
X Blocked Drain Check for blockage and clean drain
X Improper trap Check trap dimensions and location ahead of vent
X Poor Drainage Check for piping slope away from unit
Check slope of unit toward outlet
Poor venting. Check vent location
X Moisture on sensor Check for moisture shorting to air coil
Replace Air Filter
Plugged Air Filter
X
X Restricted Return Air Flow Find & eliminate restriction. Increase return duct
and/or grille size.
Check power supply and 24VAC voltage before and during
X Under Voltage
operation.
Check power supply wire size
Check compressor starting. Need hard start kit?
Check 24VAC and unit transformer tap for correct power
supply voltage
X
Check power supply voltage and 24VAC before and during
Over Voltage
operation.
Check 24VAC and unit transformer tap for correct power
supply voltage
Heating mode FP2>125°F [52°C] Check for poor air flow or overcharged unit.
Cooling Mode FP1>125°F [52°C]
X Check for poor water flow, or air flow
OR FP2< 40ϒ F [4ϒ C]
X No compressor operation See "Only fan operates"
X Compressor Overload Check and Replace if necessary
X Control board Reset power and check operation
X Dirty Air Filter Check and Clean air filter
X Unit in "Test Mode" Reset power or wait 20 minutes for auto exit.
Unit may be oversized for space. Check sizing for actual
X Unit selection
load of space.
X Compressor Overload Check and Replace if necessary
Insure thermostat set for heating or cooling operation
X Thermostat position
X Unit locked out Check for lockout codes. Reset power.
X Compressor Overload Check compressor overload. Replace if necessary.
Check thermostat wiring at heat pump. Jumper Y and R
X Thermostat wiring
for compressor operation in test mode.
HBH SERIES
42
IOM Manual