Kaisai 06RY1, Service Manual

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M thermal Mono
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Midea
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4.19 P5 Troubleshooting
Digital display output 4.19.1
Description 4.19.2

High temperature difference between water side heat exchanger water inlet and water outlet
temperatures
protection.

Mono stops running.

Error code is displayed on hydronic system main control board for refrigerant system and user interface.
Possible causes 4.19.3

Temperature sensor not connected properly or has malfunctioned.

Water piping contains air.

Insufficient water flow.

Hydronic system main PCB damaged.
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M thermal Mono
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Procedure 4.19.4
P5
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
Water piping contains air
Yes
Purge air from the water system
No
The water flow rate is not sufficient,
caused by crushed or bent water piping,
incorrect pump speed setting, high
resistance in water piping or broken
expansion vessel
Yes
Inspect the system and fix the error
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 “Main 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 5-5.3 in Part 5, 5.1 “Temperature Sensor
Resistance Characteristics”.
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Mono