Symptom: The Pump Is Blocked - Daikin Altherma 3 H MT F Installer's Reference Manual

14 | Troubleshooting

14.3.5 Symptom: The pump is blocked

Installer reference guide
230
Possible cause
Various malfunctions.
(a)
We recommend to purge air with the air purge function of the unit (to be performed by
the installer). If you purge air from the heat emitters or collectors, mind the following:
WARNING
Air purging heat emitters or collectors. Before you purge air from heat emitters or
collectors, check if
▪
If not, you can purge air immediately.
▪
If yes, make sure that the room where you want to purge air is sufficiently
ventilated. Reason: Refrigerant might leak into the water circuit, and
subsequently into the room when you purge air from the heat emitters or
collectors.
Possible causes
If the unit has been powered off for a
long time, lime might block the rotor of
the pump.
Flow error 7H is displayed
(a)
If you cannot deblock the rotor of the pump with this method, you will need to
disassemble the pump and turn the rotor by hand.
Check if
home screen of the user interface. See
"14.4.1 To display the help text in case
of a malfunction" [
information about the malfunction.
or is displayed on the home screen of the user interface.
Use a Philips No. 2 screwdriver to push
the deblocking screw of the rotor in
(0.5 cm). Then turn the deblocking
screw back and forth until the rotor is
deblocked.
Note: Do NOT use excessive force.
1
2
Check if there are 7H-08 errors in the
error history of the unit. If so, the pump
is blocked or there is not sufficient
voltage towards the pump.
EPRA08~12EAV3+W1 + ETVZ12S18+23EA6V+9W
Corrective action
or is displayed on the
4
234] for more
Corrective action
(a)
2
Daikin Altherma 3 H MT F
4P634887-1 – 2021.03