P11 Water Heat Exchanger Unit Anti-Icing Sensor Error - Panasonic 2WAY Multi Technical & Service Manual

P11 Water Heat Exchanger Unit Anti-icing Sensor Error (for only water heat exchanger unit)
Error detection method
An error is detected as follows:
• When anti-freeze temperature is detected, and recovery temperature is not reached within 3 minutes.
* Anti-freeze temperatures (When any one of the following conditions is reached.)
Hot and cold water outlet temperature
Anti-freeze temperature
* Recovery temperature (when all conditions below are met)
Hot and cold water outlet temperature
Anti-freeze temperature
Troubleshooting
1
Has the water chiller parameter been set despite the fact that
Water heat
1-1 the unit is a brine chiller? (Proceed to 1-2 if it is being used as
exchanger
a water chiller.)
unit check
1-2 Is the cold/hot water pump shut down?
1-3 Is the fl ow volume insuffi cient?
1-4 Have the sensors installed properly in the correct positions?
● For details on procedure to replace the water heat exchanger unit control board, see the instructions supplied
with the service water heat exchanger control board.
Water chiller
Less than +2°C
Less than +2°C
Less than 0°C
Water chiller
+4°C or more
+4°C or more
IV–88
Switch the power off and
Yes
repair
No 1-2
Switch on the cold/hot
Yes
water pump
No 1-3
Maintain the correct fl ow
Yes
volume
No 1-4
Replace the water heat
Yes exchanger unit's control
board
No Repair