39
INStAllAtION
fault signals description
The following tables include lists of alarm signals, their probable
cause, effect on the unit and the type of reset.
Alarm
Inverter
Alarm [P350]
- [P354] or
[P360] -
[P364]
Description
Unit status
Reset type
Verifications
Automatic
feeding cycle
Comment
-
1
EWT sensor failure
Continue
X
When the operating values return to
the correct range.
1. Check the EWT sensor (EWT).
2. Check NHC card.
-
2
LWT sensor failure
Stop
X
When the operating values return to
the correct range.
1. Check the LWT sensor (LWT).
2. Check NHC card.
-
3
Coolant temperature sensor (TR) failure
Stop cpr
X
When the operating values return to
the correct range.
1. Check the TR sensor (TR).
2. Check NHC card.
-
4
OAT sensor failure
Continue
X
When the operating values return to
the correct range.
1. Check the auxiliary OAT sensor (OAT).
2. Check NHC card.
-
5
DHW_TT sensor failure
DHW failure
X
When the operating values return to
the correct range.
1. Check the DHW sensor (DHW).
2. Check NHC card.
-
6
CHWSTEMP sensor failure
X
When the operating values return to
the correct range.
1. Check the CHWSTEMP sensor
(CHWSTEMP).
2. Check NHC card.
-
7
IAT sensor failure
Continue
X
When the operating values return to
the correct range.
1. Check the IAT sensor (IAT).
2. Check NHC card.
-
8
Internal IU temperature faults
Continue
X
When the operating values return to
the correct range.
1. Check the internal temperature
sensor UI.
2. Check NHC card.
-
9
Replacement sensor failure
Continue
X
When the operating values return to
the correct range.
1. Check the replacement sensor.
2. Check NHC card.
10
Inverter discharge temperature sensor
failure (TD)
Stop cpr
X
This error becomes permanent after 4
attempts to complete the operation.
1. Check the discharge temperature
sensor (TD).
102
11
Inverter air exchanger temperature
sensor failure(TE)
Stop cpr
X
This error becomes permanent after 4
attempts to complete the operation. 1. Check the temperature sensor (TE).
103
12
Inverter liquid temperature sensor
failure (TL)
Stop cpr
X
This error becomes permanent after 4
attempts to complete the operation. 1. Check the temperature sensor (TL).
104
13
TO inverter sensor failure
Continue
X
The operation of the unit continues
in emergency mode.
1. Check the outdoor temperature
sensor (TO).
The sensor value is set at 30 ° C in
cooling, 10 ° C in heating
the emergency mode is canceled
when any other value is detected by
the TO sensor.
108
14
Inverter suction temperature sensor
failure (TS)
Stop cpr
X
This error becomes permanent after 4
attempts to complete the operation.
1. Check the suction temperature
sensor (TS).
109
15
Inverter heatsink temperature failure
Stop cpr
X
This error becomes permanent
after 8 attempts to complete the
operation.
1. Check the correct functioning of
the fan
111
16
TE and TS inverter sensors incorrectly
connected
Stop cpr
X
This error becomes permanent after 4
attempts to complete the operation.
1. Check the temperature sensor
(TE, TS).
-
20
Loss of communication with user
interface
Continue
X
When a new message is received
from the user interface
-
21
Communication loss with inverter
Stop cpr
X
When a new message is received
from the user interface
221
22
Communication error between the
inverter boards
Stop cpr
X
Simple delay in communication.
-
23
Loss of communication with the slaves
Continue
X
Only the Master unit continues to
work.
-
24
Loss of communication with the Master
Stop
X
25
Loss of communication with the Master
Stop
X
When a new message is received
from the Master
-
31
Security entrance
Stop O Stop
heating OR Stop
cooling
X
When the security entrance is closed
-
32
Flow switch failure
Stop cpr
X
This error becomes permanent after 5
attempts to complete the operation.
-
50
Exchanger antifreeze protection based
on water temperature (in cooling)
Cooling down
X
Ignition of antifreeze heaters, if
present, when the alarm is active.
The pump is forced to start.
-
51
Exchanger frost protection based on
the temperature of the refrigerant (in
cooling)
Cooling down
X
Ignition of antifreeze heaters, if
present, when the alarm is active.
The pump is forced to start until
the manual reset of the alarm
is possible. The alarm becomes
blocking when it is repeated 12 times
in 2 hours.
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