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EN/06.2016/i09 © STULZ S.p.A. – all rights reserved
WSA ExplOrEr OriginAl inStructiOnS
9. Malfunction
problem
possible cause
recommended action
generals
The chiller does not start up
and the electronic control
is off
No power supply
Restore power supply
Main switch open
Move the main switch to position I
No power supply to the electronic control
Check the voltage of the power cables to the control.
Restore or repair the wiring
Electric control faulty
Contact the Stulz service centre
The control works but the
display is off
Cable between control and display disconnected
Reconnect the cable
Cable between control and display broken
Replace the cable
Faulty display
Contact the Stulz service centre
The control works but the
chiller does not start up
Missing external enabling signal (stand-by state displayed)
Restore the signal wiring. Provide the external enabling
signal
Failures prevent the unit from working
Check any alarms on the display (see below). Contact the
Stulz service centre
Electric control faulty
Contact the Stulz service centre
Display alarms
CP
X
thermic
X
compressor fault
Replace the compressor
Failure of the power supply circuit of the
X
compressor
(cables, remote control switch, ...)
Replace the faulty component
Failure to the thermal breaker of the
X
compressor
Replace the protection device
Fan
X
thermic
Faulty
X
fan
Replace the fan
Failure of the power supply circuit of the
X
fan (cables,
remote control switch, ...)
Replace the faulty component
Failure to the thermal breaker of the
X
fan
Replace the protection device
Pump
X
thermic
X
pump failure
Replace the pump
Failure of the power supply circuit of the
X
pump (cables,
remote control switch, ...)
Replace the faulty component
Failure to the thermal breaker of the
X
pump
Replace the protection device
EEV
X
winding
Failure of the motor winding of the
X
electronic expansion
valve
Replace the expansion valve
EEV
X
serial communication
Problems in the communication between electronic control
and
X
expansion valve
Contact the Stulz service centre
High press. group
X
Power supply failure/ failure of a condensing fan of
X
circuit
Repair the power supply to the fan/replace the fan
Faulty speed control of condensing fans of
X
circuit
Lack of signal from the electronic control: restore wiring
or replace the electronic control or replace the phase cut
control module.
Faulty signal from the electronic control: contact the Stulz
service centre
Failure of the phase cut control modul: replace
Dirty condenser/air filter (optional) of the
X
circuit
Clean the condenser/air filter (optional)
Air recirculation on the condenser of
X
circuit
Remove obstacles close to the condenser. Comply with the
clearances indicated in paragraph 5.3
Faulty high pressure switch of
X
circuit
Contact the Stulz service centre
Clogged filter-drier of the
X
circuit
Through the fluid level sight glass of the circuit
X
check for
moisture or bubbles in the refrigerant. Contact the Stulz
service centre
Excessive refrigerant gas charge resulting from a circuit
X
top up after a repair
Contact the Stulz service centre
Outside air temperature beyond the limits permitted
Contact the Stulz service centre
