Panasonic WH-UD28AE Service Manual

Also see for WH-SD24AE: Operating instructions

Contents

3715 Maintenance GuideIn order to ensure optimal performance of the unit, checks and inspections on the unit and the field wiring must be carried outregularly. 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 powersupply (i.e. indoor unit power supply, heater power supply and sanitary tank power supply).Below checks must be carried out at least once a year.1. Water pressureWater pressure should not lower than 0.05 MPa (with inspects the pressure gauge). If necessary add tap water into boilertank. Refer to boiler tank installation instruction for details on how to add water.2. Water filterClean the water filter in regularly basic.• Water filter is located inside the tube connector which is below water pump. (Refer to figure below)• Use spanner to detach the water pump’s bottom nut.• Take out the filter carefully so that not deforms it shape.• Use tap water only to wash the residue on the filter. If necessary, gently use soft brush only to clean the hard dirt.• After clean, put it back to the original location and tighten the nut connection with torque wrench.3. Pressure relief valve• Check for correction operation of pressure relief valve by turn up the level to become horizontal. (Refer to figure below)• If you do not hear a clacking sound (due to water drainage), contact your local authorized dealer.• Turn down the level after checking finish.• In case the water keeps drained out from the unit, switch off the system, and then contact your local authorized dealer.4. Indoor unit control board areaThorough visual inspection of the control board and look for defects, i.e. loose connection, melting of wire insulator and etc.5. RCCB• Ensure the RCCB set to “ON” condition before check RCCB.• Push the “TEST” button on the RCCB. The level would turn down and indicate “0” and indicate green colour if it functionsnormal.• Contact authorized dealer if the RCCB malfunction.• If RCCB functions normal, set the level to “ON” again after testing finish.