Panasonic CS-Z25UD3EAW Service Manual page 80

14.7.1 Drain Pump Control
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This unit has built-in with drain pump.
Control content
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During COOL/DRY mode.
During COOL/DRY mode, drain pump starts 10 seconds after indoor fan motor starts.
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The drain pump turns ON and turns OFF periodically. (ON or OFF duration depends on room temperature).
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After COOL/DRY mode, when unit turns OFF (power standby) or changes to HEAT mode.
The drain pump turns ON for 60 seconds immediately.
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Error judgment
When float switch detects ON signal continuously for 2 minutes 30 seconds, error code H21 are shown.
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When float switch ON has operated 2 times within 20 minutes, error code H35 are shown.
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14.7.2 Pump down Operation by CN-S
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A convenience method to activate pump down operation.
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Control start condition:
During power standby condition, short CN-S continuously between 1 second and 10 seconds.
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Control stop condition:
480 seconds after pump down operation starts.
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CN-S is shorted again during pump down operation.
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