Monobloc Outdoor Unit Service Manual
79
9.4.
Diagnosis flow chart for each error code
9.4.1.
Monobloc outdoor unit failure detection
9.4.1.1.
Alarms 1 to 7 - Temp. Sensors on NHC board
Control Parameter
Electrical connection
Alarm 1
EWT sensor failure
-
J9 on NHC
Alarm 2
LWT sensor failure
-
J8 on NHC
Alarm 3
Refrigerant Temperature (TR) sensor failure
-
J11 on NHC
Alarm 4
OAT sensor failure
-
CN602 on MCC-1599
Alarm 5
DHW_TT sensor failure
DHW Tank sensor type [P719]
(table DHW_CONF)
Terminal 14 on terminal block
TB X2
Alarm 6
CHWSTEMP sensor failure
-
Terminal 15 on terminal block
TB X2
Alarm 7
IAT sensor failure
IAT sensor type [P510]
(table GEN_CONF)
Terminal 16 on terminal block
TB X2
9.4.1.2.
Alarm 8 – Remote Controller (WUI) Indoor Temperature Failure
The sensor is located on Remote Controller (WUI), it measures the room temperature.
Alarm 8
RC (WUI) Indoor Temperature failure
If a failure occurs on the Remote controller (WUI) indoor temperature sensor, then the Remote Controller (WUI) must
be changed:
Is sensor correctly connected:
-
On terminal block?
-
and NHC board?
(refer to wiring diagram)
Correctly connect sensor
Is configuration of sensor correct
in comparison with the sensor
resistance?
(if parameter is configurable)
Are the resistance
characteristics of the
temperature sensor normal?
(check with resistance curve)
Replace defective sensor
Change the parameter value
Check NHC board and replace if defective
NO
NO
NO
YES
YES
YES
Change Remote controller (WUI)
Содержание Estia RUA-CP1701H
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