Symptom: Abnormal Presence Of Ice - Daikin altherma 3 M Service Manual

2 | Troubleshooting
Possible failure
Expansion valve incorrect
control - superheat too
low.

2.4.8 Symptom: Abnormal presence of ice

Possible failure
General ice build-up.
Ice build-up on the
outdoor unit.
Defrost operation
malfunction.
Ice build-up at entry spot
of refrigerant.
Partial ice up of coil.
Service manual
74
Root cause category: component – electrical
Root cause
▪ Faulty suction
thermistor,
▪ Faulty expansion valve
control.
Root cause
—
▪ Clogged drain holes,
▪ Snow on the outdoor
unit,
▪ Ice building up on the
casing.
NOT enough defrost
power: shortage of
refrigerant.
Refrigerant shortage.
Partial refrigerant
blockage.
Dirty coil.
Bad weather conditions.
Check
▪ Check suction
thermistor,
▪ Check the expansion
valve.
Check
—
Ice is NOT in direct contact
with fins.
▪ Check refrigerant charge,
▪ Check for leaks.
▪ Check refrigerant charge,
▪ Check for leaks.
Check refrigerant circuit.
Check if coil is dirty.
Unit is NOT powerful
enough to defrost due to
too strong wind, snow, ...
Repair
▪ Replace thermistor when
required,
▪ Replace expansion valve
when required.
Repair
Outdoor unit installation
MUST be protected from
weather (wind, snow, ...).
See installer reference
guide for correct
installation.
▪ Unclog drain holes or
remove any scraps that
can be used for ice to
build up,
▪ Remove ice.
▪ Replace refrigerant,
▪ Fix leaks.
▪ Replace refrigerant,
▪ Fix leaks.
Replace part where
blockage occurs.
Clean coil.
Outdoor unit installation
MUST be protected from
weather (wind, snow, ...).
See installer reference
guide for correct
installation.
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03