89-01" - Plate Heat Exchanger Freeze-Up Error; 89-02" - Plate Heat Exchanger Freeze-Up Warning During Space Heating / Dhw Production - Daikin EDLQO5CAV3 Service Manual

ESIE15-08B | Part 2. Troubleshooting
2.63. "89-01" – Plate heat exchanger freeze-up error
Trigger
When warning 89-02 (Tc < 0°C during
space heating) occurs 3 times (with less
than 30 minutes between each abnormal-
ity).
When warning 89-03 (Te < x°C during
defrost) occurs 3 times (with less than 30
minutes between each abnormality).
Possible cause
Faulty heat exchanger thermistor R2T.
Faulty hydro PCB A1P.
Refrigerant shortage.
Water pressure is too low
Water flow is too low.
Water volume is too low.
2.64. "89-02" – Plate heat exchanger freeze-up warning during space heating / DHW
production
Trigger
Tc is below 0°C during space heating.
Warning might result to 89-01 error if it
occurs 3 times.
R3T (liquid refrigerant) < or = 0°C during
space heating or DHW.
Possible cause
Faulty 4-way valve.
19/07/16
Daikin Altherma Monobloc CA
Effect
Unit stops operating.
Unit stops operating.
Check
Check hydrobox heat exchanger thermis-
tor R2T (see page 70).
Check if the alive led is blinking in regular
intervals.
Check if the correct spare part is installed.
Check if hydro PCB A1P receives power.
Check for refrigerant shortage (see
page 106).
Perform leak test.
Check the water pressure on the pressure
gauge.
Check the minimum water flow required
for the system. Refer to Installer Refer-
ence Guide.
Check if the smallest water volume meets
the requirements. Refer to "Installer Ref-
erence Guide". (Pay attention to the
by-pass in the water circuit!)
Effect
Unit will continue operation.
Check
Check 4-way valve (see page 99).
2. Error code based troubleshooting
Reset
Manual reset via user interface.
Manual reset via user interface.
Corrective action
Replace heat exchanger thermistor when
required (see page 124).
Adjust the power to the PCB.
Replace hydro PCB A1P when alive led is
not blinking in regular intervals.
Adjust software of hydro PCB A1P or
install correct spare part when required.
If charge is lower than indicated on name-
plate, check for leaks and recharge unit
with correct amount of refrigerant.
Increase water pressure till ~2 bar. Refer
to the Installer Reference Guide.
Check for possible water leaks.
Adjust system to meet the water flow
requirements.
Adjust system and water volume to the
requirements as described in the Installer
Reference Guide.
Reset
Auto-reset when problem is solved.
Unit will stop and restart when problem is
solved.
Corrective action
Replace 4-way valve when required (see
page 127).
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