15 Troubleshooting
Installer reference guide
90
EJHA NHY32AA
Daikin Altherma H Hybrid
4P556861-1A – 2019.05
15.5
Solving problems based on LED
behaviour
15.5.1
Location of the outdoor unit LED
Open the outdoor unit (see
"9.2.2 To open the outdoor unit" on
). The following illustration indicates the location of the
outdoor unit LED on the PCB:
LED A
PCB
15.5.2
To diagnose faults
LED behaviour
Diagnosis
LED flashing
Normal
LED on
(a)
LED off
Case 1: supply voltage (for power saving)
Case 2: power supply fault
Case 3
(a)
(a)
Follow the procedure below.
Check if the outdoor unit is faulty
1
Turn the power off and on again.
2
Check the LED within approximately 3 minutes.
If the LED behaviour recurs, the outdoor unit PCB is faulty.
Note:
Error detection should be done by using the remote control
fault diagnosis.
15.6
Solving problems based on error
codes
If the unit runs into a problem, the user interface displays an error
code. It is important to understand the problem and to take
measures before resetting an error code. This should be done by a
licensed installer or by your local dealer.
This chapter gives you an overview of all possible error codes and
their descriptions as they appear on the user interface.
For detailed troubleshooting of each error, see the service manual.
15.6.1
Error codes: Overview
Error codes of the outdoor unit
Refrigerant part
Error code
Detailed error
code
Description
A5
00
OU: High pressure cooling/
Peak
cut/ freeze protection
problem.
Please contact your dealer.
E1
00
OU: PCB defect.
Power reset required.
Please contact your dealer.
E3
00
OU: Actuation of high
pressure
switch (HPS).
Please contact your dealer.
E5
00
OU: Overheat of inverter
compressor motor.
Please contact your dealer.
E6
00
OU: Compressor startup
defect.
Please contact your dealer.
E7
00
OU: Malfunction of outdoor
unit fan motor.
Please contact your dealer.
E8
00
OU: Power input
overvoltage.
Please contact your dealer.
EA
00
OU: Cool/heat switchover
problem.
Please contact your dealer.
H0
00
OU: Voltage/current sensor
problem.
Please contact your dealer.
H3
00
OU: Malfunction of high
pressure switch (HPS)
Please contact your dealer.
H6
00
OU: Malfunction of
position
detection sensor.
Please contact your dealer.
H8
00
OU: Malfunction of
compressor
input (CT) system.
Please contact your dealer.
H9
00
OU: Malfunction of outdoor
air thermistor.
Please contact your dealer.