Service And Maintenance; Serial Number - Mitsubishi Electric ecodan geodan EHGT17D-YM9ED Mode D'emploi

5

Service and Maintenance

Troubleshooting for heat pump unit
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
Heating system does not get
up to set temperature.
Schedule function inhibits the
system from operating but
en
the heat pump operates.
Pump runs without reason
for short time.
Mechanical noise heard com-
ing from heat pump 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 dis-
play.
Electric heater is turned ON
frequently.
<Power failure>
All setting will be saved for 1 week with no power, after 1 week Date/Time ONLY will be saved.
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Serial number

■ The serial number is indicated on the SPEC NAME PLATE.
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) : 2019
13
Possible cause
Prohibit, schedule or holiday mode selected Check settings and change as appropriate.
Incorrectly sized heat emitters.
The room in which the temperature sensor
is located is at a different temperature to the
rest of the room.
Battery problem *wireless control only
Freeze stat. function is active.
Pump jam prevention mechanism to inhibit
the build up of scale.
Heaters switching on/off
Heat pump running
Air trapped in the system
Loose pipework
The system has overheated or overpressur-
ised
Dirt may be preventing a tight seal in the
valve
The heat pump unit is reporting an abnor-
mal condition
Quiet mode is activated.
Underground temperature has dropped
Disconnection of wire between UNIT SIDE
and MODULE SIDE.
Sequential number for each unit: 00001–99999
Solution
Contact installer.
Reposition the temperature sensor to a more suitable
room.
Check the battery power and replace if flat.
Normal operation no action necessary.
Normal operation no action necessary.
Normal operation no action necessary.
Try bleeding radiators (if present). If the symptoms per-
sist contact installer.
Contact installer.
Switch off power to the heat pump and any electric
heaters then contact 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 in-
staller.
Contact installer.
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