ESIE15-08B
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Part 2. Troubleshooting
2. Error code based troubleshooting
19/07/16
Page 39
Daikin Altherma Monobloc CA
2.45. “UA-16” – Communication warning between hydro PCB A1P and control box
PCB
2.46. “UA-21” – PCB combination malfunction
Faulty outdoor inverter PCB.
Check outdoor inverter PCB (see
page 101).
Check if the alive led is blinking in regular
intervals.
Check if the correct spare part is installed.
Adjust the power to the outdoor inverter
PCB.
Replace outdoor inverter PCB when
required (see page 122).
Faulty outdoor main PCB.
Check if the alive led is blinking in regular
intervals.
Check if the correct spare part is installed.
Check if the outdoor main PCB receives
power.
Adjust the power to the outdoor main
PCB.
Replace outdoor main PCB when alive led
is not blinking in regular intervals (see
page 119).
Faulty hydro PCB A1P.
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.
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.
Wiring between outdoor unit and indoor
unit is too long.
Check the length of the wiring connecting
the outdoor and indoor unit.
Shorten the lengths of the wiring connect-
ing the outdoor and indoor unit. Refer to
the Installer Reference Guide.
Trigger
Effect
Reset
Communication between hydro PCB A1P
and control box has failed.
Unit will stop operating
Manual reset via user interface.
Possible cause
Check
Corrective action
Wiring between Hydro PCB A1P and con-
trol box is too long.
Check if wiring is conform with require-
ments. Refer to Installer Reference Guide.
Correct wiring when required.
Faulty hydro PCB A1P.
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.
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.
Faulty extension PCB A4P.
Check PCB A4P (see page 86).
Check if the correct spare part is installed.
Replace extension PCB A4P when
required.
Faulty current loop PCB A2P.
Check current loop PCB A2P.
Replace current loop PCB A2P.
Faulty wiring between hydro PCB A1P
and extension PCB A4P.
Check on hydro PCB A1P:
•
X15A; X14A; X10A; X18A
• Terminals
for
wiring
Check on current loop PCB A2P:
• X1A;
X10A
Check on extension PCB A4P:
• X10A
• Terminals
for
wiring
Correct wiring when required.
Trigger
Effect
Reset
System detects combination mismatch
between extension PCB A4P and hydro
PCB A1P after the connection was
already made. Setting on hydro PCB A1P
does not match with extension PCB A4P.
Unit will stop operating.
Manual reset via user interface.