Troubleshooting - RHOSS TCAEBY 269 Mode D'emploi

TROUBLESHOOTING

PROBLEM
The circulation pump does not start (if connected)
Lack of voltage to the pump unit:
No signal from control board:
Pump blocked:
Pump motor malfunction:
Working set-point reached:
The compressor does not start
Microprocessor board alarm:
Absence of voltage, isolator switch open:
Compressor circuit breaker tripped:
Circuit breakers tripped due to overload:
No request for cooling with user system set point correct:
Working set point too high:
Defective contactors:
Compressor electric motor failure:
The compressor does not start but you can hear a buzzing noise
Incorrect power supply voltage:
Compressor contactor malfunction:
Mechanical problems in the compressor:
The compressor runs intermittently
Irregular operation of the expansion valve:
The compressor stops
Malfunctioning of high pressure switch:
(cooling mode):
Excessive ambient temperature:
Excessive refrigerant charge:
(in heating or heat recovery mode):
High water temperature (in heating or heat recovery mode)
Presence of air in the water system
(in heating or heat recovery mode):
Excessive compressor noise - Excessive vibrations
crankcase:
Mechanical problems in the compressor:
Unit running at the limit of conditions for use:
Section II :: Installation and maintenance
RECOMMENDED ACTION
check electrical connections and auxiliary fuses.
check, call in authorised service engineer.
check and clear as necessary.
overhaul or replace pump.
check
identify triggered alarm.
close isolator switch.
check the electrical circuits and the motor windings, identify possible short
circuits; check for mains overloads and loose connections.
restore fuses; check unit on start-up.
check and if necessary wait for cooling request.
check calibration and reset.
replace or repair.
check short circuit.
check voltage, investigate causes.
replace.
repair/replace compressor.
check correct functioning and replace if necessary.
check calibration and operation.
check fans, check clearances around unit and possible coil obstructions.
check unit operation limits.
drain that in excess, recovering the refrigerant.
check and adjust as necessary.
check unit operation limits.
bleed the water system.
check correct operation of the expansion valve, replace if necessary.
overhaul the compressor, replace if necessary.
check according to stated limits.
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