Instructions For The Water Pump Replacement - Mitsubishi Electric CMB-WP108NU-AA Service Handbook

[ VIII Troubleshooting ]

[9] Instructions for the water pump replacement

1.After turning off the power to the HBC controller, replace the water pump. To stop the water flow from the indoor
unit, perform the following DIPSW operations.
When replacing the water pump near the water supply port, set DIPSW4-6 to ON (DIPSW4-7 to OFF).
When replacing the other water pump, set DIPSW4-6 and DIPSW4-7 to ON.
2.Open the top panel and maintenance panel of the water pump to be replaced.
Control box
Maintenance panel
3.Remove the clips on the inlet/outlet of the water pump.
Outlet side
Inlet side
4.Remove the water pump by pulling out the inlet/outlet of the water pump.
5.After removing the water pump, check the O-ring on the sleeve for damage. If O-ring is damaged, replace the
O-ring with a new one.
6.Insert the water pump again so that debris is not trapped in the O-ring, and install the clip.
When inserting the water pump, lubricate the O-ring with soapy water.
7.After closing the panels, turn on the power to the HBC controller, and perform the air vent operation.
HWE2206A
Top panel
Nipple (and O-ring) on the connection
O-ring
Remove foreign objects with a waste cloth, if any.
Remove the clip.
- 181 - 181 GB