31
English
Error
code
Item
Failure when
Consequences
Diagnostics and solutions
Hydronic module fault codes
2 Temperature/humidity sensor
of user interface in zone 1
Value out of range
+
Code 105.0 = 1 or 4
Room temperature/humidity is not available.
Related functions are not available.
Check user interface wiring and electrical
connections.
3 TWB
Value out of range
Backup heaters are OFF
Check sensor, wiring and electrical connections.
4 TC
Value out of range
Outdoor unit stops
Domestic water valve OFF if code 127=1
Check sensor, wiring and electrical connections.
5 Domestic hot water
temperature sensor
Value out of range
+
Code 133 = 1 or 2
Booster heater OFF
Disinfection function not performed
Check sensor, wiring and electrical connections.
6
Communication with user
interface (conneted to W-C-
G-Y terminal blocks)
Communication lost
No communication between unit and interface.
Room temperature and humidity are not
available if code 105.0 = 1 or 4 or
105.1 = 1 or 4.
Unit runs with values stored in memory.
Check wiring and connections.
7
Communication with
additional user interface
(connected to Rc-Rh-G2-Y2
terminal blocks) in zone 1
Communication lost
+
Code 105.0 = 1
No communication between unit and interface.
Room temperature and humidity are not
available in zone 1.
Unit runs with values stored in memory.
Check wiring and connections.
8 Flowswitch
Water pump is OFF.
Flowswitch detects flow
Outdoor unit, backup heaters, domestic water
valve, water pump: OFF
Check setting of code 107.1
Check flowswitch.
9 Flowswitch
Water pump is ON.
Flowswitch detects no flow.
Outdoor unit, backup heaters, domestic water
valve, water pump: OFF
Check setting of code 107.0.
Check flowswitch, wiring and electrical
connections.
Check floor heating thermal cut off if connected.
If reset is needed, press the red button and check
climatic curve settings (codes 112 to 118).
10 EEProm
EEProm is corrupt
Entire system stops
Check settings of codes 100, 103, 105, 106, 107.
If settings are correct, contact service.
11 Communication
Master - Slave
Communication lost +
Code 100 = 2
Entire system stops
Check wiring and connections.
12
Communication with
additional user interface
(connected to Rc-Rh-G2-Y2
terminal blocks) in zone 2
Communication lost
+
Code 105.1 = 1
No communication between unit and interface.
Room temperature and humidity are not
available in zone 2.
Unit runs with values stored in memory.
Check user interface wiring and electrical
connections.
13
System configuration
Code 100 = 1
+1
Communication with slave
board is detected .
Entire system stops
2-zone kit is installed.
Set code 100 = 2
14 HV Communication with CDU Communication lost
Outdoor unit stops
Domestic water valve OFF if code 127 = 1
15 LWT
Value out of range
Outdoor unit stops
Domestic water valve OFF if code 127 = 1
Check sensor, wiring and electrical connections.
16 Zone control
Code 100 = 1 + Code 105.0
= 2 or
Code 100 = 2 + Code 105.0 = 2
+ Code 105.1 = 2 or Code 100
= 2 + Code 105.0 = 4 + Code
105.1 = 4
Entire system stops
Change setting of code 105.
32 Reversing Valve Error
Refrigerent liquid and expansion
temperature are not consistent
with the CDU operating mode
Outdoor unit stops
Domestic water valve OFF if code 127 = 1
Check reversing valve operations.
Check refrigerant liquid and expansion
temperature sensors.
Cycle power to clear the error.
34 EH temperature warning
Backup heater is active
+
TWB does not increase by 1 °C
every 30 min
No effect on system operation
Check backup heater operation, wiring and
electrical connections.
*
LOW domestic hot water
temperature warning
Code 133 = 1 or 2 +
Domestic hot water priority = 1 +
Booster heater schedule OFF +
code 1.5 = 0
Domestic water tank electric heater icon (
)
will flash on the user interface screen
Domestic hot water temperature is cold and
schedule prevents booster heater activation.
User can activate booster heater by setting code
1.5 = 1 (termporary activation) or by enabling it in
the schedule.
35 Disinfection not succesful
Code 133 = 1 or 2 +
Disinfection cycle not
completed within time defined
by code 143 or
Disinfection cycle not performed
due to error 5.
Domestic hot water is not produced
(unless code 1.3 = 1 or the diagnostics is
removed cycling power).
Check code 140 to 144.
Check booster heater operation.
Check booster heater wiring and electrical
connections.
If code 127 = 2 check backup heater operation.
Check domestic hot water temperature sensor,
wiring and electrical connections.
36
Configuration Mismatch
Outdoor unit should run in cool
mode +
Code 106.5 = 0 or
Unit is heat only (80AWH)
Entire system stops
Modify setting of code 106.5.
Modify requested mode.
37 Temperature/humidity sensor
of user interface in zone 2
Value out of range +
Code 105.1 = 1 or 4
Room temperature/humidity is not available.
Related functions are not available.
Check user interface wiring and electrical
connections.
Outdoor unit fault codes
