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Code
Display text
Description
Solution
H.10.20
T Dhw Zone C Open
Domestic Hot Water Temperature
Sensor Zone C Open
Domestic hot water temperature sensor zone C
open:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Sensor is not present.
Faulty sensor: replace the sensor
H.10.21
T Dhw Zone C Closed
Domestic Hot Water temperature
sensor Zone C Closed
Domestic hot water temperature sensor zone C
short-circuited:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Faulty sensor: replace the sensor
When using thermostat instead of sensor: pa
rameter CP503 must be set to off (=disable)
H.10.22
TSwimmPoolZoneC
Open
Swimming Pool Temperature Sen
sor Zone C Open
Swimming pool temperature sensor C open:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Sensor is not present.
Faulty sensor: replace the sensor
H.10.23
TSwimmPoolZoneC
Close
Swimming Pool Temperature Sen
sor Zone C Closed
Swimming pool temperature sensor zone C
short-circuited:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Faulty sensor: replace the sensor
H.10.27
T Flow Zone DHW
open
Flow temperature sensor Zone DHW
open
Flow temperature sensor zone DHW open:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Sensor is not present.
Faulty sensor: replace the sensor
H.10.28
Sens. ZoneDHW
closed
Flow temperature sensor Zone DHW
closed
Flow temperature sensor zone DHW short-circuit
ed:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Faulty sensor: replace the sensor
H.10.29
Sensor Zone DHW
open
Temperature sensor Zone DHW
open
Domestic hot water temperature sensor zone
DHW open:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Sensor is not present.
Faulty sensor: replace the sensor
12 Troubleshooting
7762666 - v.02 - 29092020
C 340 / C 640
169