Mitsubishi Electric PU(H)Y-P250YGM-A, Service Handbook

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[
VII
Control ]
[4] Operation Flow Chart
1. Mode determination flowchart
(1) Indoor unit (cooling, heating, fan mode)
[Standard]
*Note 1. Indoor unit LEV fully closed : Opening 41.
*Note 2. The system may go into the error mode on either the indoor unit or the outdoor unit side. If some of the indoor units are
experiencing a problem (except water leakage), only those indoor units that are experiencing the problems will stop.
If the outdoor unit is experiencing a problem, all connected indoor units will stop.
Start
Remote controller
display lit off
Error mode
Error stop
Error display
Self-holding of
protection function
Error command
to outdoor unit
Indoor unit LEV
fully closed.
Refer to 2-(1)
Cooling operation.
Refer to 2-(2)
Heating operation.
Refer to 2-(3)
for dry operation.
Prohibition Prohibition Prohibition
Dry display
Heating display Cooling display
Dry mode Heating mode
Fan mode
Fan display
Fan operations
Operation mode
Cooling mode
Operation command to outdoor unit (to [2])
Prohibition
"Blinking display on
the remote controller"
FAN stop
Breaker
turned on
Operation SW
turned on
Auxiliary heater
ON
Drain pump
ON
3-minute
drain pump ON
NO
NO
NO
NO
NO
NO NO NO
*Note 1
*Note 2
*Note 1
*Note 3
1. Protection function
self-holding cancelled.
2. Indoor unit LEV fully closed.
1. Auxiliary heate OFF
2. Low fan speed for
1 minute
YES
YES
YES
YES
YES YES YES
YES
Normal operation
Error
Unit in the stopped state
From outdoor unit
1