Nirvana NE55 - Trouble Shooting

13
3. System protection/Trouble shooting
Protection/Error
Code
Description
Trouble shooting
P3
Water Inlet
Temp. Sensor
Failure
Check the connection, change the sensor if necessary.
P4
Water Outlet
Temp. Sensor
Failure
Check the connection, change the sensor if necessary.
P1
Coil Temp.
Sensor Failure
Check the connection, change the sensor if necessary.
P7
Ambient Temp.
Sensor Failure
Check the connection, change the sensor if necessary.
P2
Exhaust Temp.
Sensor Failure
Check the connection, change the sensor if necessary.
E4
System High
Pressure
Failure
1. Detect the inlet/outlet water temperature.
2.Clean the water exchanger or water filter.
3.Replace the high pressure switch.
PL
Water Flow
Failure
Check water flow /switch, change the switch if
necessary.
P6
Excessive
Temperature
Difference of
Water Inlet and
Water Outlet
Check whether the water flow meets the requirement of
nameplate.
E3
High Exhaust
Temperature
Protection
1. Check whether the refrigerant of the system is leaked.
If the refrigerant leaks, repair the leak point and vacuum
it again, then charge the refrigerant according to the type
and weight of the refrigerant on the nameplate.
2. Replace exhaust temperature sensor.
3. Replace PCB control board.
P8
Excessive Low
Temp of Water
Outlet When
Cooling
No need to deal with, it’s the protection function
PC
Winter Level 1
Frost Protection
No need to deal with, it’s the protection function
PC
Winter Level 2
Frost Protection
No need to deal with, it’s the protection function