EcoNet P16AZ24A - Service Analyzer Charts

44
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High superheat
(greater than 15°F
[-8.3°C] at coil)
Low charge Check system charge.
Verify suction thermistor operation (10k thermistor) Replace thermistor.
Verify pressure transducer operation input and
output voltage
Replace thermistor and/or harness and/or control
board.
Faulty metering device, inadequate suction
thermistor or pressure transducer operation.
Restricted cap tube, EXV
High internal load Hot air (attic) entering return
Heat source on; miswired or faulty control
Restriction in liquid line Drier plugged.
Line kinked.
Low head pressure Low charge
Operating in low ambient temperatures
Vapor or liquid line subjected to high heat
source
Hot attic
Hot water line
Low line voltage Loose wire connections Check wiring.
Power company problem, transformer Report problem.
Undersized wire feeding unit Correct and complete diagnosis.
High line voltage Power company problem Report problem.
High head
pressure
Overcharge Check system charge.
Dirty heat pump coil Clean coil.
Faulty or wrong size heat pump fan motor Replace fan motor.
Faulty fan blade or wrong rotation Replace fan blade.
Replace with correct rotation motor.
Recirculation of air Correct installation.
Additional heat source Check for dryer vent near unit.
Check for recirculation from other equipment.
Noncondensibles Recover refrigerant. Evacuate and recharge system.
Equipment not matched Correct mismatch.
Short cycling of
compressor
Cycling or faulty pressure control Check pressure and address cause of high or low
pressure. Replace pressure control if faulty.
Loose wiring Check unit wiring.
Thermostat Located in supply air stream
Customer misuse
EXV restricted or not functioning properly
Internal foreign matter
Pressure transducer failure
Suction thermistor failure
EXV control failure
EXV coil failure
Distributor tube restricted Restricted with foreign matter
Kinked
Inside diameter reduced from previous compressor failure
9.3 Service Analyzer Charts
9.0 DIAGNOSTICS & TROUBLESHOOTING
Diagnostics