Lennox MPB012S4S

147
Error Code: P2
Description: Compressortophightemperatureprotection(OLP)
General Note: Ifthesamplingvoltageisnot5V,theLEDwilldisplaytheP2errorcode.
P2
Checktheairowsystem
of indoor and outdoor units.
Doesaproblemexist?
No
Clearairowblockage.
Yes
Powerofftheunitandwait
10 minutes before restarting.
Yes
Checkcompressor
temperature.Isitwithin
acceptableparameters?
Checktheoverload
protector.Isitproperlywired?
No No
Yes
Measuretheresistance
betweenthetwoportsof
theOLP.Isitzero?
Yes
ReplacetheoutdoorcontrolPCB.
No
ReplacetheOLP.
Ensure a proper connection.
Yes
Error Code: P3
Description: Outdoorunitlowtemperaturelockout.
General Note: Theoutdoorunitwilllockoutifwheninheatingmode,whentheoutdoortemperatureislowerthan-13°F(-25°C)for1hour,
theindoorunitdisplayerrorcode.
Theoutdoorunitwillresumeoperationwheneither:
TheOUTDOORtemperatureishigherthan-7.6°F(-22°C)for10minutesandcompressorhasbeenstoppedfor1hour
or
Outdoortemperatureishigherthan23°F(-5°C)for10minutes