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Components
Service manual
99
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
Is the measured voltage correct?
Action
Yes
Perform a position check of the 4-way
valve, see
No
Perform a check the main PCB, see
To perform a position check of the 4-way valve
1
First perform an electrical check of the 4‑way valve, see
When outdoor unit is combined with H Cooling indoor unit
INFORMATION
This procedure is ONLY possible when the outdoor temperature is within the
temperature range for both
Heating
and
Cooling
operation mode. See the
databook on Business Portal for the temperature range of the operation modes.
1
Activate
Heating
operation via the user interface.
INFORMATION
It is recommended to connect the service monitoring tool to the unit and verify the
operation mode of the 4-way valve.
2
Check with a contact thermometer (or by touching) if the flow through the 4-
way valve corresponds with the flow shown in the flow diagram. (See
INFORMATION
The flow through the 4-way valve is correct if the water temperature after the heat
exchanger rises/drops when operating in
Heating
/
Cooling
mode.
Is the flow correct?
Action
Yes
Skip the next step of this procedure.
No
Perform the next step of this procedure.
3
Connect a manifold to one of the service ports of the refrigerant circuit and
check the pressure (suction, discharge). Compare with normal operation
conditions of the unit.
Refrigerant pressure correct?
Action
Yes
Replace the body of the 4‑way valve,
see
101].
No
Leaks may be found in the refrigerant
circuit. Perform a pressure test of the
refrigerant circuit, see
286].
4
De-activate
Heating
and activate
Cooling
operation via the user interface.
5
Check with a contact thermometer (or by touching) if the flow through the 4-
way valve corresponds with the flow shown in the flow diagram. (See
Summary of Contents for ALTHERMA
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