110
EN
Shown on display
Type of malfunction or
fault
Cause
Solution
S2 solar exchanger probe
fault (tank)
The probe on the solar exchanger is
open or has short-circuited
- Check the sensor and its board connections
- Check operation of the board
S3 2nd solar system
delivery probe fault
The delivery probe on the 2nd
system, where applicable, is open or
has short-circuited
- Check the sensor and its board connections
- Check operation of the board
Solar application
coherence fault – hydraulic
configuration
Incorrect wiring on the solar board
probes for the type of installation
selected
- Check the wiring and the selected configuration
Number of expansion
boards connected fault
Parameters not set correctly
- Check PAR 40
Return sensor fault
The return sensor (SR) is open
or has short-circuited. The boiler
continues normal operation
- Check the sensor and its connections
Cascade delivery probe
(SMC) fault (shown on
slave no. 1 only)
The cascade delivery probe (SMC) is
open or has short-circuited, or is not
connected to the slave 1 boiler
- Check the probe and its connections to the slave 1
boiler
Communication fault
RS485 board
The RS485 board is faulty
Electrical connections incorrect or
interrupted
- Check operation of RS485 board
- Check the electrical connections
Number of boilers
connected in cascade fault
Number of cascading boilers does
not correspond to setting for PAR A1
(CASCADE)
- Check the setting for PAR A1 (CASCADE) against the
number of boilers in the cascade
Manual release performed
more than 6 consecutive
times in the last hour
A alarm repeats continuously
and has been reset more than 6
consecutive times in the last hour.
- Check what the recurring alarm refers to and find the
solution. Then turn the boiler off and on again, then
reset the alarm.
Cascade delivery probe
(SMC) fault (shown on
master only)
The cascade delivery probe (SMC) is
open or has short-circuited or is not
connected to the slave 1 boiler
- The cascade delivery probe (SMC) is open or has
short-circuited, or is not connected to the slave 1
boiler
General fault with a boiler
in the cascade (shown on
master only)
There is a fault on one of the slave
boilers
- Resolve the problem according to the alarm on the
display of the slave boiler showing a fault
Delivery probe (SMC)
disconnected error
The boiler delivery probe is
disconnected and/or damaged
- Check the wiring and replace the probe if necessary
Gas valve control circuit
hardware fault
Circuit board components damaged
- Replace the board
Gas valve control circuit
hardware fault
Circuit board components damaged
- Replace the board
Maximum number of
software errors reached
The software does not work properly - Replace the board
Generic board software
error
The software does not work properly - Replace the board
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