Operating instructions

56
Message
System characteristics Cause Measures
A9 Heat pump
Heat pump fault
■ Heat pump faulty
■ Safety high pressure
switch has responded
■ High pressure or low
pressure sensor has
responded 8 times
within 24 h
■ Fault EEV controller
■ Temperature sensors
in primary/secondary
circuit faulty
■ Hot gas klixon has
responded
■ Low pressure switch
has responded
Scan further messages
("Message history" see
page 47); check flow
rates, motor currents/
motor protection, full wave
soft starter and safety high
pressure switch.
Note
After removing fault,
switch appliance OFF and
ON again once.
AB Electric heater
Fault, instantaneous
heating water heater
(appliance faulty or high
limit safety cut-out has
responded; alternatively
no temperature rise
within 24 h)
Danger
Contact with 'live'
components can
lead to severe
injury from elec-
tric current.
Isolate the power
supply prior to
starting work on
the appliance.
Troubleshooting
Messages
(cont.)
5441 603 GB