Mitsubishi Electric City Multi CMB-WP108V-G, Service Manual

Page: 148 / 301

[
IX
Troubleshooting ]
- 139 - HWE1113B GB
1. Error Code
Drain sensor submergence (Models with a float switch)
2. Error definition and error detection method
1) If an immersion of the float switch in the water is detected while the unit is in any mode other than the Cool/Dry mode and
when the drain pump goes from OFF to ON, this condition is considered preliminary water leakage. While this error is being
detected, humidifier output cannot be turned on.
2) If the drain pump turns on within one hour after preliminary water leakage is detected and the above-mentioned condition is
detected two consecutive times, water leakage error water leakage is detected, and "2500" appears on the monitor.
3) Detection of water leakage is also performed while the unit is stopped.
4) Preliminary water leakage is cancelled when the following conditions are met:
Œ
One hour after the preliminary water leakage was detected, it is not detected that the drain pump goes from OFF to ON.
Œ
The operation mode is changed to Cool/Dry.
Œ
The liquid pipe temperature minus the inlet temperature is - 10°C [ -18°F] or less.
3. Cause, check method and remedy
<Reference>
2500
Cause Check method and remedy
(1) Drain water drainage problem
Œ
Clogged drain pump
Œ
Clogged drain piping
Œ
Backflow of drain water from other units
Check for proper drainage.
(2) Stuck float switch
Check for slime in the moving parts of the float
switch. Check for normal operation of the float switch.
(3) Float switch failure Check the resistance with the float switch turned on and
turned off.
6 minutes 6 minutes
1 5
se c onds
1 5
se c onds
1 5
se c onds
1 5
se c onds
1 5
se c onds
O N
O FF
O N
O FF
Drain pump operation triggered b y a submergen c e o f t h e li q uid level sensor
(ex c ept during t h e Cooing/Dr y mode)
Drain pump
output
Float swit ch
input
S ubmergen c e o f
t h e sensor
S ubmergen c e o f
t h e sensor
Preliminar y water lea k age
S ubmergen c e o f
t h e sensor
Water lea k age
S ensor in t h e air S ensor in t h e air
Wit h in 1- h our period Wit h in 1- h our period