Kaisai 06RY1, Service Manual

Page: 105 / 114

M thermal Mono
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Procedure 4.24.4
Pd
Air side heat exchanger refrigerant outlet
temperature sensor is loose
1
Yes
Ensure the temperature sensor is
connected properly
No
Air side heat exchanger refrigerant outlet
temperature sensor has short-circuited
or failed
2
Yes
Replace the temperature sensor
No
The air side heat exchanger heat
exchange is poor
3
Yes
Inspect the system and fix the error
No
The fan or fan motor is blocked or
damaged
Yes
Inspect the system and fix the error
No
Replace outdoor main PCB
Notes:
1. Air side heat exchanger refrigerant outlet temperature sensor and outdoor ambient temperature sensor connections are port CN9 on the refrigerant
system main PCB (labeled 12 in Figure 4-2.2 in Part 4, 2.3 “Main PCBs for Refrigerant System, Inverter Modules and Filter Boards”, (labeled 5 in Figure 4-2.4
in Part 4, 2.3 “Main PCBs for Refrigerant System, Inverter Modules and Filter Boards” and labeled 6 in Figure 4-2.6 in Part 4, 2.3 “Main PCBs for Refrigerant
System, Inverter Modules and Filter Boards”).
2. Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor’s resistance
characteristics table, the sensor has failed. Refer to Part 2, 1 “Layout of Functional Components” and to Table 4-5.1 in Part 4, 5.1 “Temperature Sensor
Resistance Characteristics”.
3. Check air side heat exchanger, fan(s) and air outlets for dirt/blockages.
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M thermal Mono
202008 105
4.25 PP Troubleshooting
Digital display output 4.25.1
Description 4.25.2

Water side heat exchanger inlet temperature is higher than outlet temperature in heating mode.

Mono stops running.

Error code is displayed on hydronic system main control board for refrigerant system and user
interface.

If PP error occurs 3 times then Hb will appear.
Possible causes 4.25.3

Temperature sensor not connected properly or has malfunctioned.

4-way valve is blocked or damaged.

Hydronic system main PCB damaged.
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