List of error codes for the Daikin Altherma air-to-water heat pump

List of error codes for the air-to-water heat pump – Daikin Altherma

EKHVH016BB6V3
EKHVX016BB6V3
EKHVH016BB6WN
EKHVX016BB6WN
EKHVH016BB9WN
EKHVX016BB9WN

Symptom 1: The unit is on (the LED y is lit), but the unit isn’t heating as expected

POSSIBLE CAUSES	CORRECTIVE ACTION
The temperature setting is incorrect.	Check the setpoint on the controller.
The water flow is too low.	• Check that all shut-off valves in the water circuit are fully open. • Check whether the water filter needs cleaning. • Make sure there is no air in the system (bleed the air). • Check the pressure gauge to make sure there is enough water pressure. The water pressure should be >1 bar (when the water is cold). • Check that the pump speed is set to maximum. • Make sure the expansion tank isn’t broken. • Check that the resistance in the water circuit isn’t too high for the pump (refer to “8.7. Setting the pump speed” on page 26).
The water volume in the system is too low.	Make sure the water volume in the system is above the required minimum value (refer to “Checking the water volume and the expansion tank’s pre-charge pressure” on page 16).

Symptom 2: The unit is powered on, but the compressor doesn’t start (space heating or domestic water heating)

POSSIBLE CAUSES	CORRECTIVE ACTION
The unit needs to start outside its operating range (the water temperature is too low).	When the water temperature is low, the system uses the backup heater to first reach the minimum water temperature (15°C). • Check that the backup heater’s power supply is correct. • Check that the backup heater’s thermal fuse is closed. • Check that the backup heater’s thermal protection hasn’t tripped. • Check that the backup heater’s contactors aren’t broken.
The off-peak power supply settings and the electrical connections don’t match.	If [D-01]=1 or 2, the wiring requires a specific setup as shown in “Connecting to an off-peak power supply” on page 22. Other correctly installed configurations are possible, but must match the type of off-peak power supply used at the site in question.
The off-peak signal was sent by the power company.	Wait for power to come back.

Symptom 3: The pump is making noise (cavitation)

POSSIBLE CAUSES

CORRECTIVE ACTION

There is air in the system.

Bleed the air.

The water pressure at the pump inlet is too low.

• Check the pressure gauge to make sure

there is enough water pressure. The water pressure should be >1 bar (when the water is cold).

• Check that the pressure gauge isn’t broken.

• Make sure the expansion tank isn’t broken.

• Check that the expansion tank’s pre-charge pressure setting is correct (refer to “Setting the expansion tank’s pre-charge pressure” on page 17).

Symptom 4: The water pressure relief valve opens

POSSIBLE CAUSES

CORRECTIVE ACTION

The expansion tank is broken.

Replace the expansion tank.

The water volume in the system is too high.

Make sure the water volume in the system is below the maximum allowed value (refer

to “Checking the water volume and the expansion tank’s pre-charge pressure” on page 16).

Symptom 5: The water pressure relief valve is leaking

POSSIBLE CAUSES

CORRECTIVE ACTION

Dirt is blocking the outlet of the pressure relief valve.

Check that the pressure relief valve is working properly by turning the valve’s red knob counterclockwise:

• If no clicking sound is heard, contact a local dealer.

• If water keeps leaking from the unit, first close the water inlet and outlet shut-off valves, then contact a local dealer.

Symptom 6: The user interface displays “n” when certain buttons are pressed

POSSIBLE CAUSES	CORRECTIVE ACTION
The current permission level is set to a level that prevents use of the pressed button.	Change the on-site setting “user permission level” [0-00], see “Field Settings” in the user manual.

Symptom 7: Insufficient space heating capacity at low outdoor temperatures

POSSIBLE CAUSES

CORRECTIVE ACTION

The backup heater operation is not enabled.

Check that the on-site setting “backup heater operation status” [4-00] is enabled, see “8.8. Field Settings” on

page 26.

Check whether the backup heater’s thermal protection has been triggered (refer to Main Unit Components, “Backup Heater Thermal Protection” on page 10 for the location of the reset

button).

Check whether the backup heater’s thermal fuse has blown

(refer to “Backup Heater Thermal Fuse” in chapter “5.2. Main Unit Components” on page 9).

The backup heater’s balance temperature

has not been set correctly.

Increase the on-site setting ‘balance temperature’ [5-01] to enable backup heater operation at a higher

outdoor temperature.

Too much heat pump capacity is being

used to heat domestic hot water (applies only to installations with a domestic hot water tank).

Check that the on-site settings for ‘space heating priority temperature’ are configured

appropriately:

• Make sure the on-site setting

“space heating priority status” [5-02] is enabled.

• Increase the on-site setting “space heating priority temperature” [5-03] to enable backup heater operation

at a higher outdoor temperature.

Error codes

When a safety device is triggered, the LED on the user interface will flash and an error code will be displayed.

A list of errors and corrective actions is provided in the table below.

Reset the safety device by turning the unit OFF, then back ON.

Instructions for turning the unit OFF
User interface mode (heating/ coorling) =)	Domestic water heating mode (w)	Press button	the y.	Press button	the v
ON	ON	1 time	1 time
ON	OFF	1 time	—
OFF	ON	— 1 time
OFF	OFF	—	—

If the safety reset procedure is unsuccessful, contact your local representative.