161
F045 Supply temp.
CCT3 short
circuit
• Short circuit in sensor or in
cable
• Both sensor connections
joined in a single terminal
• Have the fault fixed by a
qualified electrician
F046 Indoor
thermostat unit
CCT1 open
circuit
• Sensor not connected
• Sensor is faulty
• Have the fault fixed by a
qualified electrician
F047 Indoor
thermostat unit
CCT1
Short circuit
• Short circuit in sensor or in
cable
• Both sensor connections
joined in a single terminal
• Have the fault fixed by a
qualified electrician
F048 Indoor
thermostat unit
CCT2 open
circuit
• Sensor not connected
• Sensor is faulty
• Have the fault fixed by a
qualified electrician
F049 Indoor
thermostat unit
CCT2
Short circuit
• Short circuit in sensor or in
cable
• Both sensor connections
joined in a single terminal
• Have the fault fixed by a
qualified electrician
F050 Indoor
thermostat unit
CCT3 open
circuit
• Sensor not connected
• Sensor is faulty
• Have the fault fixed by a
qualified electrician
F051 Indoor
thermostat unit
CCT3
Short circuit
• Short circuit in sensor or in
cable
• Both sensor connections
joined in a single terminal
• Have the fault fixed by a
qualified electrician
F052 Open circuit in
upper boiler
temperature
sensor
• Sensor not connected
• Sensor is faulty
• Have the fault fixed by a
qualified electrician
F053 Short circuit in
upper boiler
temperature
sensor
• Short circuit in sensor or in
cable
• Both sensor connections
joined in a single terminal
• Have the fault fixed by a
qualified electrician
F054 Open circuit in
lower boiler
temperature
sensor
• Sensor not connected
• Sensor is faulty
• Have the fault fixed by a
qualified electrician
No. Fault Cause Remedy
Table 8/1 - Faults (continuation)
To Next Page