Daikin Altherma EBLQ011CA3V3 - Abnormal Presence of Ice

1 Troubleshooting
Service manual
27
EBLQ+EDLQ011~016CAV3+W1 + EBLQ+EDLQ011~016CA3V3+W1
+ EK(2)CB07CAV3 + EKMBUHCA3V3+9W1
Daikin Altherma – Monobloc
ESIE18-04 – 2019.02
Root cause category: component – mechanical
Possible failure Root cause Check Repair
Limited heat exchange between
refrigerant loop and heat sink
inverter could result in high inverter
temperatures and limited
compressor frequency.
▪ Bad contact between refrigerant
loop and inverter heat sink,
▪ Lack of refrigerant.
Check contact between refrigerant
loop and inverter PCB heat sink.
—
Root cause category: component – electrical
Possible failure Root cause Check Repair
Discharge pipe thermistor – higher
temperature measured than actual.
Deviation of thermistor (higher
temperature measured than
actual).
Check discharge pipe thermistor. Replace discharge pipe thermistor
or main PCB.
Heat sink inverter thermistor -
deviation.
Deviation of thermistor (higher
temperature measured than
actual).
▪ Check heat sink inverter
thermistor,
▪ Check inverter PCB.
▪ Replace heat sink inverter
thermistor,
▪ Replace inverter PCB.
Expansion valve incorrect control -
superheat too high.
▪ Faulty suction thermistor,
▪ Faulty expansion valve control.
▪ Check suction thermistor,
▪ Check the expansion valve.
▪ Replace suction thermistor,
▪ Replace expansion valve.
Increased compressor sound level
Root cause category: component – mechanical
Possible failure Root cause Check Repair
Compressor increased bearing
friction/bearing failure.
▪ Bad lubrication of compressor
internal rotating parts,
▪ Compressor at end of lifetime.
No checks possible. Replace compressor.
Unit produces (loud) noise or
shakes.
▪ Refrigerant overcharge,
▪ Mixing of air in refrigerant
system,
▪ Refrigerant undercharge.
Check refrigerant. After vacuum drying, charge
correct amount of refrigerant.
Root cause category: component – electrical
Possible failure Root cause Check Repair
Expansion valve incorrect control -
superheat too low.
▪ Faulty suction thermistor,
▪ Faulty expansion valve control.
▪ Check suction thermistor,
▪ Check the expansion valve.
▪ Replace thermistor when
required,
▪ Replace expansion valve when
required.
1.5.8 Abnormal presence of ice
Possible failure Root cause Check Repair
General ice build-up. — — Outdoor unit installation MUST be
protected from weather (wind,
snow, ...).
See installer reference guide for
correct installation.
Ice build-up on the outdoor unit. ▪ Clogged drain holes,
▪ Snow on the outdoor unit,
▪ 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.