Daikin Altherma HT Service Manual

Troubleshooting by Indication on the Remote Controller ESIE09-08B
204 Troubleshooting
3.59 “U7 ” Indoor Unit: Malfunction of Transmission Outdoor
Unit
Remote Control
Display
U7
Subcode 2
Applicable
Models
ER*Q 011~016*
Method of
Malfunction
Detection
Microcomputer checks the transmission of outdoor unit.
Malfunction
Decision
Conditions
When transmission is not carried out normally for a certain amount of time
Supposed
Causes
 Improper connection of transmission wiring between outdoor unit and external control
adaptor for outdoor unit
 Improper cool/heat selection
 Improper cool/heat unified address (outdoor unit, external control adaptor for outdoor unit)
 Defect of outdoor unit PC board (A1P)
 Defect of external control adaptor for outdoor unit
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
(V2824)
C/H
SELECT is set to “IND”.
Replace the outdoor unit PC
Board (A1P).
YES
Cool/heat selection is
unified.
Set C/H SELECT to “IND”.
NO
NO
C/H SELECT is set to
“MASTER”.
C/H SELECT is set to
“SLAVE”.
Set C/H SELECT to “IND”.
YES
YES
Set C/H SELECT to “IND”.
Replace the outdoor unit PC
board (A1P).
NO
NO
YES
( )
( )
( )
( ) To select “IND”, press the BS2 button (set) till H3P led is on. Then press BS3 button (return) to confirm.

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++