Lennox MMDA048S4-1P User Manual

Lennox Mini-Split Service Manual / Page 236
P6 Flow Charts
High Pressure Connection
Check wiring connections between high pressure
switch and main PCB.
Yes
Determine if High pressure switch is faulty.
Method: Disconnect the plug. Measure the resistance
of the high pressure protector, if the protector is normal
the value is o,
Yes
Make necessary corrections.
No
Replace high pressure protection switch.
No
Check the outdoor ambient temperature. The outdoor
ambient temperature should not be higher than 50 °C
or 122 °F.
No
Stop the unit.
Yes
Check if the outdoor unit ventilation is good
Yes
Make corrections to allow for proper
ventilation
No
Check if the outdoor fan runs properly
See Fault code E8 to properly diagnose
outdoor fan motor.
No
Yes
Check outdoor coils. The outdoor unit coils should be
clean and free of any debris.
Clean outdoor coils.
Yes
No
Replace outdoor main board.
No
Check whether the refrigerant system is OK.

Lennox MMDA048S4-1P Specifications

General

Brand	Lennox
Model	MMDA048S4-1P
Category	Air Conditioner
Language	English