3 | Components
Service manual
131
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
Did the fuse blow or did the field
supplied circuit breaker of the booster
heater trip?
Action
Yes Replace the booster heater, see
"3.5.2Repair procedures"[4132].
No Return to "3.5.1Checking
procedures"[4129] of the booster
heater and continue with the next
procedure.
To perform a check of the booster heater contactor(s)
Prerequisite: First perform an electrical check of the booster heater, see
"3.5.1Checking procedures"[4129].
1 Measure the power supply voltage between the following terminals of the
booster heater contactor:
▪ K3M: 2‑4
The measured voltages MUST be 230VAC ± 10%.
Is the measured power supply voltage
correct?
Action
Yes Skip the next step.
No Continue with the next step.
2 Check the power supply (source) of the booster heater.
Is the power supply (source) of the
booster heater correct?
Action
Yes Correct the wiring and/or components
between the power supply (source) and
the booster heater contactor K3M, see
"6.2Wiring diagram"[4314].
No Adjust the power supply (source) of the
booster heater.
3 With the Actuator test run still active, activate booster heater test.
4 Measure the voltage between the following terminals of the booster heater
contactor.
▪ K3M: 1‑3 / 2‑4
The measured voltages MUST be 230VAC ± 10%.