04 - Water Flow Problem During Domestic Hot Water Production - Daikin altherma 3 M Service Manual

2 | Troubleshooting
2.3.2 7H-04 – Water flow problem during domestic hot water production
Service manual
12
Trigger
Water flow abnormality
determined mainly during
domestic hot water.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
NOTICE
Focus the troubleshooting on the domestic hot water circuit.
1 Check that all stop valves of the water circuit are open. See
4
circuit" [ 299].
Possible cause: Closed stop valve in the water circuit.
2 Purge the water circuit. See
Possible cause: Air in the water circuit.
3 Check the water flow. See
Possible cause: Water flow is too low.
4 Check the water pressure. See
Possible cause: Water pressure is too low.
5 Check if a by‑pass is installed in the water circuit. See
4
circuit" [ 299].
Possible cause: No by‑pass installed in the water circuit.
6 Perform an electrical check of the water flow sensor. See
4
sensor" [ 268].
Possible cause: Faulty water flow sensor.
7 Perform a check of the 3-way valve. See
Possible cause: Faulty 3‑way valve.
8 Perform a check of the water pump. See
Possible cause: Faulty water pump.
9 Perform a check of the hydro PCB. See
Possible cause: Faulty hydro PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Effect
Unit will stop operating.
"4.3 Water circuit" [
4
"4.3 Water circuit" [
"4.3 Water circuit" [
"3.1 3-way
"3.24 Water
"3.12 Hydro
Reset
Manual reset via user
interface.
"4.3 Water
4
299].
299].
4
299].
"4.3 Water
"3.22 Water flow
4
valve" [ 86].
4
pump" [ 276].
4
PCB" [ 160].
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03