Service
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199
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‘19 • HM-T-340
Troubleshooting guide
220 - High pressure alarm
YES
YES
NO
NO
Open the service valves.
NO
Defective the pressure
sensor (BP4) →replace.
Are the service valves fully open?
Is the connection of the pressure
sensor (BP4) OK?
Is the characteristics of the pressure
sensor (BP4) OK?
Correct it.
YES
1. During cooling:
- Does the fan motor run?
- Is the air flow obstructed?
- Is the installation space sufficient?
2. During heating:
- Is the indoor module’s sensor for
the heat exchanger correctly
connected?
- Is the filter blocked?
NO
NO
NO
YES
NO NO
YES
YES
YES
YES
NO
Is the service valve on the water
line open?
Open it.
Is the valve(s)
functioning properly?
Is the operation signal of the
valves outputted correctly?
Replace the indoor unit relay board AA23.
Replace the valve(s).
Still the phenomenon persists,
If the phenomenon persists,
Is there clogging on the strainer on
the water line?
YES
NO
Clean - up the strainer.
Is air - bleed done properly? Bleed the air in the water line.
Is the circulation pump setting
(Menu 5.11.1.2) done properly?
Set the appropriate value to
obtain enough water flow.
Is the operation signal of the pump
outputted correctly?
YES
Replace the pump.
Replace the indoor unit relay board AA23.
Troubleshooting guide
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