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IV. SERVICE DIAGNOSIS
Before making a diagnosis, check for proper supply voltage, water supply pressure,
electrical part connections, and component installations.
1. OUTPUT TEST
This mode is to locate the cause of the trouble.
Shutdown
1) Press the ON/OFF button to shut down the unit. The
display starts flashing “run” to
prepare for shutdown. Then, the display shows “oFF” and the unit shuts down.
2) Unplug the unit.
Diagnosis
1) Plug in the unit.
2) During the 5 second delay, press the ON/OFF button for more than 1 second. The
unit enters the output test mode.
3) Check whether the unit runs in the following sequence:
(1) Every component is de-energized.
(2) In 1 second, the compressor energizes and the display shows “888”.
(3) In 5 seconds, the compressor is still energized and the hot gas valve opens.
(4) In 5 seconds, the compressor de-energizes, the hot gas valve closes and the
fan motor energizes. When set to “1 (DC)” [Setting 19: 1 (AC) or 1 (DC)], the fan
motor runs at the speed set by the fan speed control (DC/high speed) [Setting 23:
0 to 5V].
(5) In 5 seconds, the fan motor de-energizes and the pump motor energizes. The
pump motor runs at the speed (A) set by the DC pump speed A: high speed [Setting
31: 0 to 5V].
(6) In 5 seconds, the pump motor de-energizes and the water valve 1 opens.
(7) In 5 seconds, the water valve 1 closes and the water valve 2 (*) opens.
(8) In 5 seconds, the water valve 2 closes and the drain valve opens.
(9) In 5 seconds, the drain valve closes and the cleaning valve (*) opens.
(10) In 5 seconds, the cleaning valve closes and every load de-energizes to go back
to step (1) above.
* The water valve 2 and cleaning valve are not provided for KM-40C-HC, KM-60C-
HC and KM-80C-HC.
