Trouble Shooting
21
n/a No output on printboard. Defective fuse or open/short circuit on
specific circuit.
Repair or replace fuse,
open/short circuit or replace printboard.
Printboard damaged by high voltage (for
Premium RT1 burnt)
Replace printboard.
Broken electronic relay (TRIAC) Replace defective TRIAC or printboard
(operation of TRIAC can easily be tested
with a 40 W light bulb).
n/a Compressor not running. Broken compressor or open/short circuit
compressor wiring.
Repair wiring or replace defective
compressor.
Compressor overload or broken Overload
Protector (OLP) on top of the compressor.
Wait a certain time to cool down or
replace defective OLP.
Compressor settings incorrect. Check settings, at least one compressor
should be programmed active.
C01=ON C00=OFF
n/a Seawater pump(s)
running directly after
power up controller.
Wiring pump 1 (seawater) mixed-up with
pump 2 (chilled water).
Check wiring.
n/a Compressor starts or
stops continuously.
Lack of chilled water. Check for leaks in water system.
n/a No or insufficient cooling
or heating performance.
Bad air flow or water flow,
filthy or blocked circulation.
Ensure air or water flow
(see A01 and/or A02).
Lack of refrigerant. Lack of refrigerant mostly recognized by a
low static pressure before start-up and
non-fluctuating LP associated with a low
HP pressure reading.
Check for refrigerant leaks, repair if
necessary and charge required amount of
refrigerant.
Oil lock. Operate the unit in heat cycle.
Intervention by a refrigerant specialist
might be necessary.
Technical Memo available.
Blocked refrigerant circuit.
(Drier, capillary or expansion valve).
To be determined by a refrigerant
specialist.
Technical Memo available.
Bad compressor. To be determined by a refrigerant
specialist.
n/a Pumps running
continuously.
When additional relays are used to
operate pumps a small leaking current
from the printboard may operate the relay
continuously.
Remove R56 + C24 and/or R57 + C27
from the printboard.
n/a Inaccurate temperature
read-out of room /
ambient temperature,
water temperature
(premium) or evaporator
temperature (classic).
Temperature sensor not installed on the
right position, interference by
environment or read-out deviation.
Check for interference by direct sunlight,
heat radiation from components near to
the sensor.
Calibrate sensor.
Replace defective sensor.
Failure
code
Description Possible cause Solution
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