MAINTENANCE AND OPERATING MANUAL
Troubleshooting
HAS T 070÷140
96
ENGLISH
EN
The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited.
F
Low
pressure
• Refrigerant compressor stops.
• icon illuminates.
• General alarm relay trip.
Circuit has insufficient refrigerant charge
Call in a qualified refrigeration engineer to check for leaks and
eliminate them.
Have the circuit charged by a qualified refrigeration engineer.
G
Compressor
internal
protection
trip
• icon illuminates.
• General alarm relay trip.
• Refrigerant compressor stops.
Thermal load too high
Check that user water temperature and ambient air temperature are
within rated limits.
Restore thermal load to within prescribed limits.
Wait a few minutes before starting the unit again.
Circuit has insufficient refrigerant charge
Call in a qualified refrigeration engineer to check for leaks and
eliminate them.
Have the circuit charged by a qualified refrigeration engineer.
H
Display off.
• Despite the presence of voltage on the
board terminals the display remains
blank.
Control board fuse has blown
Change the fuse.
Eliminate disturbance on the power feeding line.
I
Pressure
transducer
faulty or
disconnected
• General alarm relay trip. Transducer disconnected or short-circuited
Check that the transducer is correctly connected to the control board
terminals and the cable is undamaged. If necessary, replace the
transducer with a genuine original replacement part.
J
Fans
overload
• Fans stopped.
• General alarm relay trip.
• Refrigerant compressor stops.
• icon illuminates.
• One of the fans is running noisily.
Check the status of fans, electrical connections, and power supply.
K
Pump
overload
• Pump not working.
• General alarm relay trip.
• Refrigerant compressor and pump stop.
• icon illuminates.
• Pressure difference (read on the unit
pressure gauge) with pump running and
pump stopped is lower than the available
pressure head.
Reset thermal cutout.
Increase hydraulic circuit pressure drop by partially closing,
for example, a pump outlet cock.
Check for the presence of electrical power.
L
Water
differential
pressure
switch (not
present)/
flow switch
alarm trip
• icon illuminates.
• General alarm relay trip.
• Refrigerant compressor and pump stop.
Check condition of pump.
Water circuit is blocked externally to the unit.
M
Heat
recovery/
desuperheate
r enabled but
water is cold
• Heat recovery/desuperheater water cold. Check operating mode (chiller only).
PROBLEM SYMPTOM CAUSE/REMEDY
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