Space Heating Capacity Shortage - Daikin Altherma EBLQ011CAV3 Service Manual

1 Troubleshooting
Possible failure
Air in the water circuit.
Water circuit (partially) blocked.
Root cause category: component – mechanical
Possible failure
Refrigerant shortage.
Air Purge blocked - air trapped in
water system.
Root cause category: component – electrical
Possible failure
Refrigerant pressure sensor -
higher pressure measured than
actual.
Discharge pipe thermistor – higher
temperature measured than actual.
Expansion valve incorrect control -
superheat too high.
Backup heater NOT working.
Deviation of outlet water after
backup heater thermistor will
influence the backup heater
control.
Flow sensor deviation – flow
measured higher than actual.
3‑way valve blocked.
1.5.11

Space heating capacity shortage

Root cause category: end user
Possible failure
Too low leaving water temperature
setpoint.
Too low space heating setpoint on
room thermostat.
Space heating NOT activated.
Root cause category: parameter (setting)
Possible failure
External room thermostat used
with setting [C‑07] on value 2 (=
RT control).
Service manual
30
Root cause
NOT enough air purged.
Dirty water.
Root cause
▪ Refrigerant leakage,
▪ Incorrectly charged.
Component failure.
Root cause
Deviation of refrigerant pressure
sensor (higher value measured
than actual).
Deviation of thermistor (higher
temperature measured than
actual).
▪ Faulty suction thermistor,
▪ Faulty expansion valve control.
Component failure.
▪ Deviation of thermistor (higher
temperature measured than
actual),
▪ Bad contact between sensor
and pipe.
Component failure.
Component failure.
Root cause
User set too low leaving water
temperature setpoint by schedule
or manual operation.
User set too low room setpoint by
schedule or manual operation.
Root cause
Wrong setting of [C‑07] - unit
control method.
Check
▪ Check if all air purge valves are
open,
▪ Check if air purge valves are
installed on all highest points of
the field installed water circuit.
Check water circuit (unit + field) for
blockages.
Check
▪ Check refrigerant charge,
▪ Pressure test the system to
check for leakage.
Check air purge valve.
Check
Check refrigerant pressure sensor. Replace refrigerant pressure
Check discharge pipe thermistor.
▪ Check suction thermistor,
▪ Check the expansion valve.
Check backup heater.
Check outlet water after backup
heater thermistor.
Check the flow sensor.
Check the 3‑way valve.
Check
Check leaving water setpoint.
Check room thermostat setpoint.
Check if space heating is
activated.
Check
Check setting [C‑07].
EBLQ+EDLQ011~016CAV3+W1 + EBLQ+EDLQ011~016CA3V3+W1
Repair
Purge air out of unit and field
supplied water system and backup
heater.
Remove possible blockages and
check the water quality.
Repair
If required, repair the leak and
charge the correct refrigerant
amount.
Replace air purge valve.
Repair
sensor.
Replace discharge pipe thermistor
or replace PCB.
Replace suction thermistor or
replace expansion valve.
Replace backup heater.
Replace outlet water after backup
heater thermistor or PCB A1P.
Replace the flow sensor.
Replace the 3‑way valve.
Repair
Adapt leaving water setpoint.
(Remark: check the weather
dependent settings (relation
outdoor temperature - setpoint) in
case weather dependent control is
activated.)
Adapt room thermostat setpoint.
(Remark: check the weather
dependent settings (relation
outdoor temperature - setpoint) in
case weather dependent control is
activated.)
Repair
Adjust setting to match application
- see installer reference guide.
+ EK(2)CB07CAV3 + EKMBUHCA3V3+9W1
Daikin Altherma – Monobloc
ESIE18-04 – 2019.02