Panasonic Urban Multi MX1R Series, Service Manual, Page: 467 / 643

Outline of Control PACD011001C2
446 Function UM Combination “MA1R Series” Using R-407C
When the Float Switch is Tripped During Heating Operation:
During heating operation, if the float switch is not reset even after the 5 minutes operation, 5 seconds stop,
5 minutes operation cycle ends, operation continues until the switch is reset.
When the Float Switch is Tripped and “AF” is Displayed on the Remote Controller:
Note:
If the float switch is tripped five times in succession, a drain malfunction is determined to have occurred.
“AF” is then displayed as operation continues.