Daikin Altherma HT Service Manual

ESIE09-08B Troubleshooting by Indication on the Remote Controller
Troubleshooting 207
3.62 “UF ” System is not Set yet
Remote Control
Display
UF
UF
subcode 6: QA wiring problem.
UF subcode 10: Transmission problem with outdoor unit.
Applicable
Models
All models of indoor units
All models of outdoor units
Method of
Malfunction
Detection
Malfunction
Deci
sion
Conditions
The malfunction is determined as soon as the abnormality aforementioned is detected through
checking the system for any erroneous connection of unit.
Supposed
Causes
 Improper connection of transmission wiring between indoor-outdoor unit
 QA wiring problem
 Defect of indoor unit PC board
Troubleshooting
Note: Wiring check operation may not be successful if carried out after the outdoor unit has been off
for more than 12 hours.
Caution
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
(V2830)
Are
indoor - outdoor
transmission wiring
and QA wiring
normal?
Replace indoor unit PC board.
After fixing incorrect wiring,
push and hold the RESET
button on the master outdoor
unit PC board for 5 seconds.
The unit will not run for up to
12 minutes.
YES
NO

Daikin Altherma HT Specifications

General

Type	Air-to-water heat pump
Refrigerant	R-410A
Water Outlet Temperature	Up to 80°C
Operating Temperature Range	-20°C to 35°C
Power Supply	3-phase, 400V
Energy Efficiency Class (Heating)	A++