Maytag Amana M9S80-U Series Installation Instructions Manual page 29

Ultra low nox gas furnace

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Table of Contents

Troubleshooting Chart

Symptom

Furnace fails to operate

LED Status

Fault Description

Polarity of 115 volt AC is reversed

EEA

Poor unit ground

Gas valve is energized when it should not be

EEb

Internal gas valve error

Gas valve is not energized when it should be

EEC

External Gas Valve Error

Auxiliary limit switch (blower compartment) circuit

EEd

E10

Grounding Error

E11

Burner limit switch circuit is open

E12

Redundant relay open alarm

E13

Redundant relay stuck closed alarm

EbF

Inducer communication alarm

E1b

APS reference error

E1C

APS null error

E1d

APS span error

E1E

APS pressure error

E1F

APS input error

EEH

Twinning error

EbL

Low circulator current

EbU

Circulator current unexpected

EdO

No shared data

Correct polarity, check and correct wiring if necessary

Verify proper ground, correct if necessary

Check wiring in gas valve circuit

Replace integrated control board

Check wiring in gas valve circuit

Replace integrated control board

Furnace power was turned off during heat cycle.

Blower not operating during heat

is open

Faulty aux limit or wiring

Check grounding

Check and correct gas supply pressure

Check flue and air inlet for blockage, proper length,

elbows, and termination

Check wiring connection in limit circuit

Check burner temperature switch. Replace if necessary

Replace integrated control board

Check Red, Black, White harness & connections to

inducer & control board