ESIE15-08B
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Part 2. Troubleshooting
3. Symptom based troubleshooting
19/07/16
Page 63
Daikin Altherma Monobloc CA
3.14. Outdoor unit is iced up (defrost problem)
3.15. Energy metering is 'wrong'
Possible failures
Root cause
Check
Corrective action
Root cause category: hardware
General ice build-up.
Outdoor unit installation must
be protected from weather
(wind, snow, ...).
Refer to Installer Reference
Guide for correct installation.
Ice build-up on the outdoor
unit.
• Clogged
drain
holes.
•
Snow on the OU.
•
Ice building up on the
casing.
Ice is not in direct contact with
fins.
•
Unclog drain holes or
remove any scraps that
can be used for ice to build
up.
• Remove
ice.
Defrost operation malfunction.
Not enough defrost power:
shortage of refrigerant.
•
Check refrigerant charge.
•
Check for leaks.
• Replace
refrigerant.
• Fix
leaks.
Ice build-up at entry spot of
refrigerant.
Refrigerant shortage.
•
Check refrigerant charge.
•
Check for leaks.
• Replace
refrigerant.
• Fix
leaks.
Partial ice up of coil.
Partial refrigerant blockage.
Check refrigerant circuit.
Replace part where blockage
occurs.
Dirty coil.
Check if coil is dirty.
Clean coil.
Bad weather conditions.
Unit is not powerful enough to
defrost due to too strong wind,
snow, ...
Outdoor unit installation must
be protected from weather
(wind, snow, ...).
Refer to Installer Reference
Guide for correct installation.
Possible failures
Root cause
Check
Corrective action
Root cause category: Software
kWh values measured with field
supplied meters show different
values as the user interface.
Backup heater wiring is not cor-
rect
Check backup heater wiring,
refer to installer reference guide
Adjust wiring if required
Values on user interface are
incorrect, show strange values.
User interface is replaced or
reset to factory settings; Previ-
ous measurements are lost.
Check if user interface is
replaced or reset.
Reset measurements of field
supplied electrical meters and
reset user interface to factor set-
tings and reset hydro PCB to
factory settings.
Values on user interface are
incorrect, show strange values.
Hydro PCB A1P is replaced or
reset to factory settings; Previ-
ous settings are lost.
Check if hydro PCB A1P is
replaced or reset.
Reset measurements of field
supplied electrical meters and
reset user interface to factor set-
tings and reset hydro PCB to
factory settings.
Unit operates in emergency
mode.
Backup heater is allowed in
emergency mode, setting
[A.5.1.2=automatic]
Check setting [A.5.1.2]
If you don't want the backup
heater to run automatically in
emergency mode, adjust setting
[A.5.1.2]