Unit Troubleshooting | 51Greensource CDi Series SM Model
8733819578 (2019/02)Greensource CDi Series SM Model
Subject to change without prior notice
Table 11 Unit Troubleshooting
EWT LOW-LIMIT
TRIP
Compressor,
Loop Pump,
Auxiliary Heat
Low loop temperature
detected. Entering water
temperature falls below low
loop water protection
setpoint. EWT < LLWP
Setpoint.
Loop has reached a temperature
outside the unit operating range
compressor has been disabled, and
Auxiliary Heat is enabled for heating
operation. Loop pump will run to allow
loop temperature to recover.
NOT COOLING
FAULT, LWT < EWT
Warning LWT is less than EWT
Unit is operating in cooling mode, but
LWT is lower than EWT: Check RV.
Service/replace.
NOT HEATING
FAULT, LWT > EWT
Warning LWT is greater than EWT
Unit is operating in heating mode, but
LWT is higher than EWT: Check RV.
Service/replace.
NO WATERFLOW
CONDITION
Compressor,
Loop Pump
No water flow has been
detected. No difference
between LWT and EWT.
Verify water supply and associated
components. Verify recommended
factory water flow. Verify loop pump,
fuse, and operation. Service/replace.
WATERFLOW LOW
CONDITION
Warning
Low water flow has been
detected. Minimal
difference between LWT
and EWT.
Verify water supply and associated
components. Verify recommended
factory water flow. Verify loop pump,
fuse, and operation. Service/replace.
POWER FAILURE
DETECTED
Appliance
Controller has sensed
sudden power loss.
Nominal voltage is lower
than 21 VAC.
Check line voltage is between
208–240 VAC. Verify P1 — 1, 2 is
greater than 21 VAC. Verify continuity
of fuse F4. Service/replace.
LOW LOOP WATER
FAULT
Compressor,
Loop Pump,
Auxiliary Heat
LWT has fallen below LLWP
setpoint. Controller has
initiated Low Loop Water
Protection.
Loop has reached a temperature
outside the unit operating range,
compressor has been disabled, and
Auxiliary Heat is enabled for heating
operation. Loop pump will run to allow
loop temperature to recover.
FAN ERROR FAULT
Blower,
Compressor
Fan motor is not running.
Controller has attempted to
start motor and is receiving
no feedback signal.
Verify blower line voltage. Verify ECM
motor is connected to P4.
OVERVOLTAGE
Appliance
Overvoltage condition
detected. Power supply
voltage is 10% above
nominal valve.
Check line voltage is between
208–240 VAC. Verify P1 — 1, 2 is 24
VAC. Verify continuity of fuse F4,
Service/replace.
UNDERVOLTAGE
Appliance
Brownout voltage condition
detected. Power supply
voltage is 10% below
nominal valve.
Check line voltage is between
208–240 VAC. Verify P1 — 1, 2 is 24
VAC. Verify continuity of fuse F4,
Service/replace.
Unit Troubleshooting
Problem Check Possible Cause Action
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