Maintenance Guide - Panasonic WH-MDC09C3E8 Service Manual

15. Maintenance Guide

In order to ensure optimal performance of the unit, checks and inspections on the unit and the field wiring must be
carried out regularly. Please request a licensed technician for carry out maintenance job.
Before carried out any maintenance or repair work, and removing the front plate of heat exchanger unit, always
switch off all power supply (i.e. Monobloc unit power supply, heater power supply and sanitary tank power supply).
Below checks must be carried out at least once a year.
1 Water pressure
Water pressure should not lower than 0.05 MPa (with inspects the pressure gauge). If necessary add tap
water into boiler tank. Refer to boiler tank installation instruction for details on how to add water.
2 Pressure relief valve
Take out the cover with remove the mounting screw for access to the pressure relief valve.
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Check for correction operation of pressure relief valve by turn up the lever to become horizontal. (Refer
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to figure below)
If you do not hear a clacking sound (due to water drainage), contact your local authorized dealer.
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Turn down the lever after checking finish.
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In case the water keeps drained out from the unit, switch off the system, and then contact your local
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authorized dealer.
Reinstall the cover with tighten the mounting screws properly, if the pressure relief valve is functioning
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normal.
3 Monobloc unit control board area
Thorough visual inspection of the control board and look for defects, i.e. loose connection, melting of wire
insulator and etc.
4 RCCB
Ensure the RCCB set to "ON" condition before check RCCB.
Turn on the power supply to the Monobloc unit.
This testing could only be done when power is supplied to the Monobloc unit.
WARNING
Becareful not to touch parts other than RCCB test button when the power is supplied to Monobloc Unit. Else, electrical shock
may happen.
Push the "TEST" button on the RCCB. The lever would turn down and indicate "0" and indicate green
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colour if it functions normal.
Contact authorized dealer if the RCCB malfunction.
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Turn off the power supply to the Monobloc unit.
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If RCCB functions normal, set the lever to "ON" again after testing finish.
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