74
No.
Fault symptom
Possible cause
Explanation - Solution
34
The energy monitor val
-
ue seems not correct.
Note:
There could be some
discrepancies between the
actual and the calculated
values.
If you seek for accuracy,
please make sure to
connect power meter(s)
and heat meter to FTC
board. Both should be
locally supplied.
1. Incorrect setting of the energy monitor
1. Check the setting by following the procedure below.
(1) Check if the DIP switch is set as the table below.
Consumed electric energy
SW3-4
Electric energy meter
(Local supply)
OFF
Without
ON
With
(2) In the case external electric energy meter and/or heat meter is not used,
check if the setting for electric heater and water pump(s) input is correct by
referring to <Energy monitor setting> in "9-4. Service menu".
(3) In the case external electric energy meter and/or heat meter is used, check
if the unit of output pulse on external meter matches with the one set at the
main remote controller by referring to <Energy monitor setting> in "9-4. Ser
-
vice menu".
2. Non-connectable type of external meter (local
supply) is connected.
2. Check if the external meter (local supply) is connectable type by referring to
<Energy monitor setting>" in "9-4. Service menu".
3. External meter (local supply) failure
3. Check if signal is sent to IN8 to IN10 properly. (Refer to section 6. WIRING
DIAGRAM)
Replace the external heat meter if defective.
4. FTC board failure
4. Check the FTC control board.
• Check for faulty wiring.
• If no problem found with the wiring, the FTC control board is faulty. Replace
the board.
35 Heat pump is forced to
turn ON and OFF.
Smart grid ready input (IN11 and IN12) is used,
and switch-on and off commands are input.
Normal operation no action necessary.
Delivered heat energy
SW3-8
Heat meter
(Local supply)
OFF
Without
ON
With
Annual Maintenance
It is essential that the cylinder unit is serviced at least once a year by a qualified individual. Any spare parts required should be purchased from Mitsubishi Electric.
NEVER
bypass safety devices or operate the unit without them being fully operational.
<Annual maintenance points>
Use the Annual Maintenance Log Book as a guide to carrying out the necessary checks on the cylinder unit and outdoor unit.
OCH570C
Summary of Contents for EHPT20X-MHCW
Page 108: ......
