Kaisai 06RY1, Service Manual

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M thermal Mono
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Procedure 4.25.4
PP/Hb
Water side heat exchanger water inlet /
outlet temperature sensor is loose
1
Yes
Ensure the temperature sensor is
connected properly
No
Water side heat exchanger water inlet /
outlet temperature sensor has
short-circuited or failed
2
Yes
Replace the temperature sensor
No
The 4-way valve is blocked or damaged
3
Yes
Replace the 4-way valve
No
Replace outdoor main PCB
Notes:
1. Water side heat exchanger water inlet temperature sensor and water side heat exchanger water outlet temperature sensor connections are port CN6 on
the hydronic system main PCB (labeled 8 in Figure 4-2.1 in Part 4, 2.2 “Min PCB for Hydronic System”).
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 to 4-5.2 in Part 4, 5.1 “Temperature
Sensor Resistance Characteristics”.
3. Restart the unit in cooling mode to change the refrigerant flow direction. If the unit does not operate normally, the 4-way valve is blocked or damaged.
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M thermal Mono
202008 107
4.26 HE Troubleshooting
Digital display output 4.26.1
Description 4.26.2

Communication error between main control board of hydronic module and Ta/room thermostat transfer
PCB

Mono stops running.

Error code is displayed on hydronic system main PCB, outdoor unit main PCB and user interface.
Possible causes 4.26.3

Temperature collecting plate(Optional) connection wire is not connected.

Temperature collecting plate(Optional) is damaged.
Procedure 4.26.4
HE
Temperature collecting plate
connection wire is not connected.
Yes
Check the connection line and joint.
No
Temperature collecting plate is
damaged.
Yes
Replace temperature collecting plate
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