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WSHP-SVX01D-EN 85
Troubleshooting
Checklist
Deluxe Controls
Troubleshooting units which contain the deluxe control option may be made easy by using the three LEDs (light emitting
diodes). These LEDs are provided for indicating the operating mode of the controller. The LEDs are intended to aid in trou-
bleshooting maintenance. The LEDs are labeled on the circuit board with numbers as referenced in Table 12.
Problem Heating Cooling Cause Correction
High head pressure
X Trash in heat exchanger Backflush
X Low water flow Increase GPM
X X Overcharge of refrigerant Decrease charge
X X Non-condensable in system Evacuate and recharge by weight
X X Water too hot Decrease temperature
X Dirty filter Clean / replace
X Inadequate air flow Check, clean blower and coil
Low suction pressure
X X Undercharged Locate leak, repair and recharge
X X Restricted thermal expansion valve Repair / replace
X Inadequate air flow Check, clean blower and coil
X Dirty filter Clean/replace
X Inadequate GPM Increase GPM
Low Pressure switch open
X Inadequate GPM Increase GPM
X Water too cold Increase temperature
X Inadequate air flow Increase CFM
X Dirty filter Clean/replace
X X Undercharged with refrigerant Increase charge
X X Defective pressure switch Replace
X X Heat transfer fluid too cold Raise water temperature
Table 12: Diagnostic LEDs
Color: Green Color: Red Controller
Mode
LED1 LED2 LED3
OFF OFF OFF Control OFF
ON OFF OFF Normal/Compressor OFF
ON OFF FLASH Anti-short cycle
ON OFF ON Normal/Compressor ON
FLASH ON OFF Brownout Condition
ON FLASH ON Soft Lockout (low pressure)
ON FLASH FLASH Soft Lockout (high pressure)
ON ON ON Manual Lockout (low pressure)
ON ON FLASH Manual Lockout (high pressure)
ON FLASH OFF Manual Lockout (condensate over-
flow)
ON ON OFF Compressor Disable