225
Troubleshooting of control system
SMGB0066 rev.0 - 12/2009
Troubleshooting
Service Manual
7
7.5. TroUBlESHooTInG of ConTrol SySTEM
7.5.1. System controller
• fault codes and diagnostics
Fault codes are displayed in the default display as “FAUL 1” to “FAUL 13”. The table below describes the meaning of the
fault code, the behaviour of the system during that fault condition and suggested remedial action to solve the problem.
Code
fault description
System Behaviour
remedy
FAUL 0
No fault detected
System operates normally
FAUL 1
No supply water temperature
sensor (TSUP) or sensor failure.
Heat Pump and Boiler (or Electric Heater) will be
disabled.
Check sensor operation and sensor wiring.
FAUL 2
No return water temperature
sensor (TRET) or sensor failure.
The system will continue to operate, but the heat
pump may operate even when the return temperature
is too high.
Check sensor operation and sensor wiring.
FAUL 3
No mixed water temperature
sensor (TMIX) or sensor failure.
The mixing valve will close and no heating will be
available.
Check sensor operation and sensor wiring.
FAUL 4
No DHW temperature sensor
(TDHW) or sensor failure.
There will be no DHW tank heating available.
Check sensor operation and sensor wiring.
FAUL 5
No outdoor temperature sensor
(TEXT) or sensor failure.
The system will continue to operate, but with a fixed
outdoor temperature of 10°C.
Check sensor operation and sensor wiring.
FAUL 6
Loss of communications with RF
receiver.
System will continue to operate, but no room influence
is possible, and control will not follow the thermostat
time programme.
Check wiring to RF Receiver. Please refer
to the RF Receiver installation guide.
FAUL 7
Loss of connection to the heat
pump control signal.
The heat pump and electric heater will be disabled.
Check control wiring to heat pump.
FAUL 8
Water temperature goes above
maximum (mixing system only).
The mixing valve will close to prevent overheating of
underfloor system.
If problem persists, check system sensors
and valve operation.
FAUL 9
Fault notified by the heat pump.
Heat Pump and Electric Heater will be disabled.
Refer to the heat pump installation
guide. To allow the electric heater or
boiler to continue operating (manual
release), press the + and SEL buttons
simultaneously.
FAUL 10 Failure of the binding between RF
receiver and thermostat
System will continue to operate, but no room influence
is possible, and control will not follow the thermostat
time programme.
Check wiring to RF Receiver. Please refer
to the RF Receiver installation guide.
FAUL 11 Incorrect device connected to RF
receiver terminals.
System will continue to operate, but no room influence
is possible, and control will not follow the thermostat
time programme.
Check wiring to RF Receiver. Please refer
to the RF Receiver installation guide.
FAUL 12
Failure of the RF receiver to
receive messages from the
thermostat.
System will continue to operate, but no room influence
is possible, and control will not follow the thermostat
time programme.
Check wiring to RF Receiver. Please refer
to the RF Receiver installation guide.
FAUL 13
The chosen extension is not
allowed in this configuration.
The system will continue to operate normally without
the extension.
Select a configuration where the extension
is allowed.
• reset to factory default condition
Should it be necessary to reset the controller to the factory default condition, press the
and buttons together during the
power-on cycle. Remember to re-select the desired hydraulic configuration and set the necessary installation parameters.
• Adjusting the time
To adjust only the time during normal operation use the
or
buttons to adjust the time and press the green
button again to confirm any changes.
