Kaisai 06RY1, Service Manual

Page: 59 / 114

M thermal Mono
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Midea
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Procedure 4.4.4
E2
Communication wires P Q E have short
circuited, disconnected or are
misconnected
1
Yes
Reconnect the communication wires
No
Communication wires P Q E are not
connected in a daisy chain
Yes
Connect the communication wires in a
daisy chain
No
Wires between outdoor main control
board for refrigerant system and electric
control box communication terminals
block are loose
Yes
Ensure the wires are connected properly
No
Interference from high voltage (220V or
higher) wires
Yes
Ensure the communication wires and
high voltage wires are separated
No
Communication wires are close to a
source of electromagnetic radiation such
as transformer or strong fluorescent lamp
Yes
Remove the source of interference, or
add additional shielding to the
communication wires
No
Replacing electric control box
communication terminals block resolves
the error
No
Replace hydronic system main PCB
Notes:
1. Measure the resistance among P, Q and E. The normal resistance between P and Q is 120Ω, between P and E is infinite, between Q and E is infinite .
Communication wiring has polarity. Ensure that the P wire is connected to P terminals and the Q wire is connected to Q terminals.
Midea CAC Confidential
M thermal Mono
202008 59
4.5 E3, E4, H2, H3, Ed, HA, H5, H9 Troubleshooting
Digital display output 4.5.1
Description 4.5.2

E3 indicates a backup electric heater water outlet temperature sensor error.

E4 indicates a domestic hot water tank temperature sensor error.

H2 indicates a water side heat exchanger refrigerant outlet (liquid pipe) temperature sensor error.

H3 indicates a water side heat exchanger refrigerant inlet (gas pipe) temperature sensor error.

Ed indicates a water side heat exchanger water inlet temperature sensor error.

HA indicates a water side heat exchanger water outlet temperature sensor error.

H5 indicates a room temperature sensor error.

H9 indicates a zone 2 water outlet temperature sensor error.

Eb indicates solar panel temperature sensor error

E7 indicates balance tank upper temperature sensor error

EC indicates
balance tank nether temperature sensor error

Mono stops running.

Error code is displayed on hydronic system main control board for refrigerant system and user
interface.
Possible causes 4.5.3

Temperature sensor not connected properly or has malfunctioned.

Damaged hydronic system main PCB.
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