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16.3 HEATING MECHANICAL CHECKS FLOW CHART
Unit Running?
YES NO
Go to Electrical
Pressure problems? Checks Flow Chart
High Head Pressure Low Head Pressure Low Suction Pressure
Dirty Filters Low on Charge Dirty Outdoor Coil
Dirty Indoor Coil Low Indoor Temperature Inadequate Air Flow
Over Outdoor Coil
Inoperative Indoor Blower Open IPR Valve
Closed Indoor Inoperative OD Fan
Overcharge Check Valve (Check Defrost Control)
Inadequate Indoor Inoperative Compressor Low On Charge
Air Flow Valves
Non-condensibles Restricted Outdoor Restricted Outdoor
Metering Device Metering Device
Broken Indoor
Blower Belt Restricted Restriction in System
Filter Drier
Wrong Indoor Blower Rotation Closed Indoor Check Valve
Reversing Valve
Failure
Inadequate Ducts Recirculation of Outdoor Air
Restricted
Filter Drier
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