The following table is to be used as a guide to possible problems. It is not exhaustive and all problems should be investigated by the installer or another competent person.

Users should not attempt to repair the system themselves.

At no time should the system be operating with the safety devices by-passed or plugged.

Fault symptom

Cold water at taps

(systems with DHW tank)

Heating system does not get up to

set temperature.

The cooling system does not cool

down to the set temperature. (ONLY

for ER series)

After DHW operation room tempera-

ture rises a little

Heating emitter is hot in the DHW

mode. (The room temperature rises.)

Schedule function inhibits the sys-

tem from operating but the outdoor

unit operates.

Pump runs without reason for short

time.

Mechanical noise heard coming from

indoor unit

Noisy pipework

Water discharges from one of the

relief valves.

Small amounts of water drip from

one of the relief valves.

An error code appears in the main

remote controller display.

Heat pump is forced to turn ON and

OFF.

It takes longer to heat water in the

DHW mode.

Hot water is insufficient.

All setting will be saved for 1 week with no power, after 1 week Date/Time ONLY will be saved.

Serial number

■ The serial number is indicated on the SPEC NAME PLATE.

Sequential number for each unit: 00001–99999

Month of manufacture: A (1), B (2), C (3), D (4), E (5), F (6), G (7), H (8), J (9), K (10), L (11), M (12)

Year of manufacture (western calendar) : 2021

Possible cause

Scheduled control off period

All hot water from DHW tank used

Heat pump or electric heaters not working

Prohibit, schedule or holiday mode selected

Incorrectly sized heat emitters

The room in which the temperature sensor is located is

at a different temperature to the rest of the house.

Battery problem *wireless control only

Malfunction of pump or mixing valve

Valves on heating system are closed.

When the water in the circulation circuit is unduly hot,

Cooling mode starts with a delay for the protection of

the outdoor unit.

When the outdoor ambient temperature is significantly

low, Cooling mode does not start running to avoid freez-

ing of the water pipes.

At the end of the DHW mode operation the 3-way valve

diverts hot water away from the DHW tank into space

heating circuit. This is done to prevent the cylinder unit

components from overheating. The amount of hot water

directed into the space heating circuit is dependent on

the type of system and the pipe run between the plate

heat exchanger and the cylinder unit.

The 3-way valve may have foreign objects in it, or hot

water may flow to the heating side due to malfunctions.

Freeze stat. function is active.

Pump jam prevention mechanism to inhibit the build up

of scale

Heaters switching on/off

3-way valve changing position between DHW and

heating mode

Air trapped in the system

Loose pipework

The system has overheated or overpressurised.

Dirt may be preventing a tight seal in the valve.

The indoor or outdoor unit is reporting an abnormal

condition.

Smart grid ready input (IN11 and IN12) is used, and

switch-on and off commands are input.

The operation mode of DHW is set to 'ECO'.

DHW setting, operation mode, DHW max. temp., DHW

temp. drop, DHW recharge

1, 2022

Solution

Check schedule settings and change if necessary.

Ensure DHW mode is operating and wait for DHW tank to re-heat.

Contact installer.

Check settings and change as appropriate.

Contact installer.

Reposition the temperature sensor to a more suitable room.

Check the battery power and replace if flat.

Contact installer.

Open the valves.

Normal operation no action necessary

If the freeze stat. function is not necessary, contact installer to change the

settings.

Normal operation no action necessary

Contact installer.

Normal operation no action necessary

Try bleeding radiators (if present) If the symptoms persist contact installer.

Contact installer.

Switch off power to the heat pump and any immersion heaters then con-

tact installer.

Twist the valve cap in the direction indicted until a click is heard. This

will release a small amount of water flushing dirt from the valve. Be very

careful the water released will be hot. Should the valve continue to drip

contact installer as the rubber seal may be damaged and need replacing.

Make a note of the error code number and contact installer.

Normal operation no action necessary

Confirm the setting and change the operation mode as necessary.

Review the setting of 'DHW'.

Operate the unit in 'Forced DHW'.

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Service And Maintenance; Serial Number - Mitsubishi Electric ecodan EHPT Series Bedieningshandleiding