Water Leakage From Humidifier - Mitsubishi Electric PUHY-RP200 Service Handbook

[ IX Troubleshooting ]
1. Error Code
2600

Water leakage from humidifier

2. Error definition and error detection method
1) If the float switch for detecting water leakage is submerged in the water in the humidifier's drain pan and when the drain pump
goes from OFF to ON, this condition is considered a preliminary water leakage. While the preliminary water leakage error is
being detected, the humidifier cannot output the on signal. The discharge valve will be closed.
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, this is detected as a water leakage, and "2600" will appear on the monitor.
ŒIndoor units will not come to an abnormal stop.
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:
ŒOne hour after the preliminary water leakage was detected, it is not detected that the drain pump goes from OFF to ON.
3. Cause, check method and remedy
(1) Water leakage through the solenoid valve for the
humidifier
(2) Drain water drainage problem
ŒClogged drain pump
ŒClogged drain piping
ŒBackflow of drain water from other units
(3) Stuck float switch
Check for slime in the moving parts of the float
switch.
(4) Float switch failure
(5) Humidifier relay fault
ŒSolenoid valve relay drive circuit fault
Note that there are float switches for detecting water leakage and the ones on the humidifier drain pump.
Drain pump operation triggered by a submergence of the liquid level sensor
(except during the Cooing/Dry mode)
Drain pump
output
Float switch
(for water leakage
detection)
signal input
HWE10010
Cause
10 minutes
ON
OFF
ON
OFF 15 15
seconds seconds
Submergence of
Sensor in the air
the sensor
Preliminary water leakage
Within 1-hour period
Check method and remedy
Check the solenoid valve for leakage with the humidifier
being stopped.
Check for proper drainage.
Check the float switches for normal operation. (Two in
the tank at the top and one in the drain pan at the bot-
tom)
Measure the resistance with the float switches (two in
the tank at the top and one in the drain pan at the bot-
tom) being turned on and turned off.
Replace the humidifier relay.
10 minutes
15 15
seconds seconds
Submergence of Sensor in the air
the sensor
Within 1-hour period
- 164 -
15
seconds
Submergence of
the sensor
Water leakage
GB