10 Troubleshooting
Installer and user reference guide
48
SERHQ020~0 SEHVX20~64BAW
Split packaged air-cooled water chiller
4P508020-1A – 2018.01
1
With the unit at a standstill and setting mode 2 active, set the
required function B (refrigerant recovery operation/vacuuming
operation) to ON (ON).
Result:
The indoor unit and the outdoor unit expansion valves
open completely and some solenoid valves are turned on. The
H1P LED lights up. The user interface indicates test operation
and operation is prohibited.
2
Cut off the power supply to the indoor units and the outdoor unit
with the circuit breaker. After the power supply of one side is cut
off, cut off the power supply of the other side within 10 minutes.
Otherwise, communication between the indoor units and the
outdoor unit may become abnormal and the expansion valves
will be completely closed again.
3
Recover the refrigerant by a refrigerant reclaimer. For details,
see the operation manual delivered with the refrigerant
reclaimer.
DANGER: RISK OF EXPLOSION
Pump down – Refrigerant leakage.
If you want to pump
down the system, and there is a leak in the refrigerant
circuit:
▪ Do NOT use the unit's automatic pump down function,
with which you can collect all refrigerant from the
system into the outdoor unit.
Possible consequence:
Self-combustion and explosion of the compressor
because of air going into the operating compressor.
▪ Use a separate recovery system so that the unit's
compressor does NOT have to operate.
NOTICE
Make sure to NOT recover any oil while recovering
refrigerant.
Example:
By using an oil separator.
9.4
Checklist for yearly maintenance
of the indoor unit
Check the following at least once a year:
▪ Pressure relief valve hose (if present)
▪ Water pressure relief valve
▪ Electrical component box
▪ Water pressure
▪ Water filter
▪ pH-value
Pressure relief valve hose
Check whether the pressure relief valve hose is positioned
appropriately to drain the water.
Water pressure relief valve
Turn the red knob on the valve counter-clockwise and check if it
operates correctly:
▪ If you do not hear a clacking sound, contact your local dealer.
▪ In case the water keeps running out of the unit, close both the
water inlet and outlet shut-off valves first and then contact your
local dealer.
Switch box
Carry out a thorough visual inspection of the switch box and look for
obvious defects such as loose connections or defective wiring.
WARNING
If the internal wiring is damaged, it has to be replaced by
the manufacturer, its service agent or similarly qualified
persons.
Water pressure
Check whether the water pressure is above 1 bar. If it is lower, add
water.
Water filter
Clean the water filter.
NOTICE
Handle the water filter with care. Do NOT use excessive
force when you reinsert the water filter so as NOT to
damage the water filter mesh.
10
Troubleshooting
10.1
Overview: Troubleshooting
This chapter describes what you have to do in case of problems.
It contains information about:
▪ Solving problems based on error codes
10.2
Error codes: Overview
Main code
Cause
Solution
Failure writing memory (EEPROM error)
Contact your local dealer.
Water circuit malfunction
▪ Check that water flow is possible (open all valves in the
circuit).
▪ Force clean water through the unit.
R410A expansion valve error (K11E/K12E)
▪ Check wiring connections.
▪ Contact your local dealer.
Water system warning
▪ Check filter.
▪ Make sure all valves are open.
▪ Contact your local dealer.
Capacity error
Contact your local dealer.
Bad ACS communication
Contact your local dealer.
R410A liquid thermistor error (R13T/R23T)
▪ Check wiring connections.
▪ Contact your local dealer.
