Daikin Altherma 3 M - Page 73

2 | Troubleshooting
Service manual
73
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
Root cause category: installation
Possible failure Root cause Check Repair
PHE condenser (water
side) (partial) blockage.
Dirty water (particles). ▪ Check water flow rate
registered by flow
sensor,
▪ Check water side plate
type heat exchanger for
blockage.
▪ If required replace the
water plate type heat
exchanger,
▪ Check the water quality.
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 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 PCB.
▪ Replace heat sink
inverter thermistor,
▪ Replace 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.
Symptom: 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.