Maintenance Guide - Panasonic WH-MDC05F3E5 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. mono bloc 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 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.
o
Move the lever into a horizontal position to open the valve.
o
If you do not hear a clacking sound (due to water drainage), contact your local authorized dealer.
o
Push the lever back down after you have finished the check.
o
If the water continues to drain from the unit switch off the system and contact your local authorised
o
dealer.
Reinstall the cover with tighten the mounting screws properly, if the pressure relief valve is functioning
o
normal.
3 Mono bloc 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 mono bloc unit.
This testing could only be done when power is supplied to the mono bloc unit.
Be careful not to touch parts other than RCCB test button when the power is supplied to Mono bloc unit. Else,
electrical shock may happen.
Push the "TEST" button on the RCCB. The lever would turn down and indicate "0", if it functions normal.
o
Contact authorized dealer if the RCCB malfunction.
o
Turn off the power supply to the Mono bloc unit.
o
If RCCB functions normal, set the lever to "ON" again after testing finish.
o
5 Reset overload protector
Overload Protector serves the safety purpose to prevent the water over heating. When the Overload
Protector trip at high water temperature, take below steps to reset it.
a. Take out OLP Cover.
b. Use a test pen to push the centre button gently in order to reset the Overload protector.
c. Fix the OLP Cover to the original fixing condition.
Lever
Cover
Mounting
Turn up
screws
Pressure relief valve
WARNING
Use test pen to
push this button
for reset Overload
protector.
How to reset Overload protector
81
Pressure
relief valve