Operating instructions

59
Message
System characteristics Cause Measures
C9 Refrigerant circuit
Refrigerant circuit fault:
■ Safety high pressure
switch has activated
■ Compressor motor
protection (thermal
relay) has responded
(if installed: Full wave
soft starter or separate
compressor motor pro-
tection has responded)
■ Hot gas klixon has
responded
■ Check flow and return
temperature sensors in
primary and secondary
circuits.
■ Check primary and sec-
ondary circuits for pres-
sure and throughput
(see also message A9).
■ Have heat pump tested
by a refrigeration engi-
neer.
The switching signal can
be tested at connection
215.4 (230 V~) of the main
PCB.
Note
After removing fault,
switch appliance OFF and
ON again once.
CA Primary source
Primary circuit fault:
■ Primary circuit pres-
sure switch/frost pro-
tection monitoring has
responded
■ Primary pump thermal
motor protection
■ Check safety equip-
ment on cross connect
PCB terminals X3.9 and
X3.8; in systems with-
out safety equipment,
check jumper between
X3.9/X3.8.
■ Check connection at
terminals 26.1/26.2
(jumper fitted in the
delivered condition,
plug
sH
is located in the
cable trunking at the
control unit front).
The switching signal can
be tested at connection
215.3 (230 V~).
Troubleshooting
Messages
(cont.)
5441 603 GB
Service