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MULTI V 5 Outdoor Unit Service Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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ERROR CODES
Please refer to the Safety Precautions on pages 4-7 for more detail to prevent injury or death regarding the operation and service
troubleshooting of the Multi V product.
WARNING
Error No. 237
Error No. Description Details Causes
237
Communication
error between
outdoor unit PCB
and indoor unit
PCB.
Indoor unit communications PCB is not receiv-
ing signal from outdoor unit communications
PCB for more than 3 minutes. Check RS-485
communications for issues.
1. Check if the outdoor unit has been powered
and if auto addressing has occurred.
2. Check communication cable.
3. Check outdoor unit communication mod-
ule.
See also Error Code No. 05: Indoor Unit PCB Communication Error between Outdoor Unit and Indoor Unit, and Error Code No. 238: Outdoor Unit
PCB Communication Error Between Indoor Unit and Outdoor Unit.
Is the outdoor unit powered?
Turn on power to the outdoor unit.
No
Yes
Has the auto address-
ing procedure been per-
formed?
No
Perform the auto addressing procedure.
Verify that it was successful with no errors.
Is the outdoor unit
communication module oper-
ating properly?
Yes
No
Check if outdoor unit communication
module installation and connections are
correct; if not reconnect and / or reinstall.
1. Check the communication cable between
outdoor unit and indoor unit. Reconnect
communication cable.
2. Check if communication cable / con-
nections are properly installed and / or
damaged. Replace communication cable
/ connections if necessary.
Is the communication cable
connected correctly?
No
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