Troubleshooting - Trane Exergy S 180 Installation And Operation Manual

6.2 Troubleshooting

Failure codes
Device failures are displayed in the control panel's Alarms view.
Failure
Refrigerant gas
detected
No cold water flow
Electrical supply
phase fault
Suction pressure low Cooling water too cold or too low flow causing
evaporator
temperature low
Discharge pressure
high
Condensing
temperature high
Hot gas temperature
high
Suction superheat low Expansion valve control problem.
Motor starter tripped
Communication lost to
VFD
Discharge pressure
high, pressure switch
64 (66)
Before performing any troubleshooting steps on electrical components,
check the appliance's operating status from the control panel screen.
Probable cause
Gas leak indicator has detected gas. The unit
leaks refrigerant or there is external gas in the
machinery space (for example due to painting
work).
Problem with pump, a closed valve, air in
pipes, lack of water, flow switch adjusted
incorrectly.
Wrong phase order in electricity supply, wire
loose, or blown fuse.
ice in evaporator, problem with expansion
valve, or some refrigerant has leaked out.
Cooling water too cold or too low flow causing
ice in evaporator, problem with expansion
valve, or some refrigerant has leaked out.
If enough refrigerant, evaporating and
condensing temperatures should be within 10
°C of water temperatures 10 min. after stop.
Heating water too hot or too low flow in
condenser, or too high refrigerant charge
level. If refrigerant charge is correct,
condensing temperature should be within 5
°C of temperature of water out when running
(unless very low or very high flow).
Heating water too hot or too low flow in
condenser, or too high refrigerant charge
level. If refrigerant charge is correct,
condensing temperature should be within 5
°C of temperature of water out when running
(unless very low or very high flow).
Compressor overheated, too high difference
between evaporating and condensing
temperature and too low power in
compressor.
Too high current.
Fieldbus communication problem between
controller and VFD.
Heating water too hot or too low flow in
condenser.
Recommended actions
Try resetting the alarm. If the alarm
resets and the heat pump starts
again, there is no leak. If the alarm
persists and there is no outside
cause, contact Customer Service.
Check.
Check fuses. If ok, contact
Customer Service.
Check operating conditions. If
not near freezing point, contact
Customer Service.
Check operating conditions. If
not near freezing point, contact
Customer Service.
Check warm water flow, check
warm water temperature
(compared to maximum).
Check warm water flow, check
warm water temperature
(compared to maximum).
If the compressor's minimum power
is set lower than 60%, try raising
it, otherwise contact Customer
Service.
Contact Customer Service.
If VFD, check VFD for alarms,
otherwise check motor overcurrent
protection device in electrical
cabinet.
Check wiring, contact Customer
Service.
Check warm water flow, check
warm water temperature compared
to maximum.
EXES01 2150EN