Daikin EKHBH008BB Series, Installation Manual

Installation manual

47

EKHBH/X008BB

Indoor unit for air to water heat pump system

4PW62570-1A – 01.2011

Symptom 4: The water pressure relief valve opens

Symptom 5: The water pressure relief valve leaks

Symptom 6: The user interface displays "

n

n

n

n

" when 

pressing certain buttons

Symptom 7: Space heating capacity shortage at low outdoor 
temperatures

Symptom 8: [4-03] and maximum tank set point is not according 
to the applicable tank

1.

In case of domstic hot water tank with built-in electrical booster
heater (EKHW*) and [4-03]=5 or maximum domestic hot water
set point is 60°C, the wrong field setting and logic is activated
according to the applicable tank.

2.

In case of domestic hot water tank without electrical booster
heater (EKHTS) and [4-03]

≠

5 or maximum domestic hot water

set point is 78°C, the wrong field setting and logic is activated
according to the applicable tank.

Symptom 9: Temperature values displayed on the remote 
controller (user interface) are displayed in °F instead of °C

P

OSSIBLE

CAUSES

C

ORRECTIVE

ACTION

The expansion vessel is broken.

Replace the expansion vessel.

The water volume in the installation 
is too high.

Make sure that the water volume in 
the installation is under the 
maximum allowed value (refer to 

"Checking the water volume and 
expansion vessel pre-pressure" on 
page 16

).

P

OSSIBLE

CAUSES

C

ORRECTIVE

ACTION

Dirt is blocking the water pressure 
relief valve outlet.

Check for correct operation of the 
pressure relief valve by turning the 
red knob on the valve counter 
clockwise:

• If you do not hear a clacking 

sound, contact your local dealer.

• In case the water keeps running 

out of the unit, close both the 
water inlet and outlet shut-off 
valves first and then contact your 
local dealer.

P

OSSIBLE

CAUSES

C

ORRECTIVE

ACTION

The current permission level is set to 
a level that prevents using the 
pressed button.

Change the "user permission level" 
field setting [0-00], see 

"8.9. Field 

settings" on page 26

.

P

OSSIBLE

CAUSES

C

ORRECTIVE

ACTION

Backup heater operation is not 
activated. 

Check that the "backup heater 
operation status" field setting [4-00] 
is turned on, see 

"8.9. Field settings" 

on page 26

.

Check whether or not the thermal 
protector of the backup heater has 
been activated (refer to 

Main 

components

, 

"18. Backup heater 

thermal protector" on page 11

 for 

location of the reset button).
Check if booster heater and backup 
heater are configured to operate 
simultaneously (field setting [4-01], 
see 

"8.9. Field settings" on page 26

).

Check whether or not the thermal 
fuse of the backup heater is blown 
(refer to 

"Main components"

, 

"19. Backup heater thermal fuse" on 
page 11

 for location of the reset 

button).

The backup heater equilibrium 
temperature has not been 
configured correctly.

Raise the 

'

equilibrium temperature

'

field setting [5-01] to activate backup 
heater operation at a higher outdoor 
temperature.

Too much heat pump capacity is 
used for heating domestic hot water 
(applies only to installations with a 
domestic hot water tank).

Check that the

 '

space heating priority 

temperature

'

 field settings are 

configured appropriately:

• Make sure that the 'space heating 

priority status' field setting [5-02] is 
enabled.

• Raise the 'space heating priority 

temperature' field setting [5-03] to 
activate booster heater operation 
at a higher outdoor temperature.

P

OSSIBLE

CAUSES

C

ORRECTIVE

ACTION

At the time of setting DIP switch 
SS2-2, wrong field wiring caused 
wrong detection of tank type.

Check all field wiring between indoor 
unit and tank switch box.

Reset procedure

• Power off the indoor unit and put 

SS-2 to OFF.

• Power on the indoor unit, it means 

that the indoor unit will detect no 
domestic hot water tank.

• Power off the indoor unit and put 

SS2-2 to ON again.

• Power on the indoor unit and the 

the indoor unit will detect again the 
type of tank: tank with built-in 
electrical booster heater 
(EKHW*)([4-03] default value will 
be 3), 

or

 tank without electrical 

booster heater (EKHTS)([4-03] 
default value will be 5).

P

OSSIBLE

CAUSES

C

ORRECTIVE

ACTIONS

You accidentally changed the setting 
to view the temperature values in °F 
by pushing the 

ib

 and 

jb

buttons simultaneously.

To change the display back to °C, 
push 

ib

 and 

jb

 buttons 

simultaneously for 5 seconds. 
Execute same procedure to change 
back to the °F display. The default 
temperature display is in °C.