Troubleshooting Chart - Amana MEC96 Series Manual

TROUBLESHOOTING CHART

Green
Symptoms
LED Code
•Furnace fails to operate
•None
•Control board LED is off
•Furnace is waiting for a
•Solid ON
call
•Furnace fan only is
•Rapid Flash •None
running
•Normal operation with •One
low stage call for cooling repeating
(Ylo & G) flash
•Normal operation with •Two
high or single stage call repeating
for cooling (Y & G) flashes
•Normal operation with
low stage call for heat •None
(W1)
•Normal operation with
high or single stage call •None
for heat
•Furnace does not
operate, three Amber •None
flashes on control board
•Furnace does not
operate, four Amber •None
flashes on control board
•Furnace does not
operate, rapid Amber •None
flashes on control board
•Furnace does not
operate, one Red flash •None
on control board
•Furnace does not
operate, two Red
•None
flashes on control board,
possible inducer
operation
•Furnace does not
operate, three Red •None
flashes on control board
Amber Red
LED Code LED Code
•Defective disconnect switch
•defective door switch • No
•None •None
115 volt power •No 24 volt
power
•Furnace is not receiving a
•None •None
call
•Furnace is receiving a call for
•None
fan (24 volts on G terminal
•Normal operation with low
•None •None
stage call for cooling (Ylo & G)
•Normal operation with high
•None •None or single stage call for cooling
(Y & G)
•One
•Normal operation with low
repeating •None
stage call for heat (W1)
flash
•Two
•Normal operation with high
repeating •None
or single stage call for heat
flashes
•Three
repeating •None •W2 call present without W1
flashes
•Four
•Ylo or Y call present without
repeating •None
G
flashes
•Rapid •None •Low flame sense current
•One
•Flame sensed when no
•None repeating
flame should be present
flash
•Two
•None repeating •Pressure switch stuck closed
flashes
•Three
•Low fire pressure switch
•None repeating
stuck open
flashes
Fault Description
•Determine cause and restore
proper high and low volt power
supply
•None Required
•None Required
•None Required
•None Required
•None Required
•None Required
•Faulty thermostat or
thermostat wiring or
improperly connected
thermostat wires
•Faulty thermostat or
thermostat wiring or
improperly connected
thermostat wires
•Dirty / coated flame rod, poor
flame, improper gas pressure,
poor flame sense wire or
connections
•Gas valve stuck open,
improper wiring to gas valve,
shorted flame rod or wire
•Faulty pressure switch,
pressure switch wires shorted,
control board inducer relay
stuck closed
•Faulty pressure switch,
pressure switch or tubing or
wiring / connection, control
board inducer relay failed, vent
pipe restriction / excessive
elbows or length
54
Check Cautions
•Confirm electrically safe
condition before
proceeding with repairs
•Confirm electrically safe
condition before
proceeding with work
•Confirm electrically safe
condition before
proceeding with work
•Confirm electrically safe
condition before
proceeding with work
•Confirm electrically safe
condition before
proceeding with work
•Confirm electrically safe
condition before
proceeding with work
•Confirm electrically safe
condition before
proceeding with work
•Confirm electrically safe
condition before
proceeding with repairs
•Confirm electrically safe
condition before
proceeding with repairs
•Clean flame rod with
steel wool. Confirm
electrically safe condition
before proceeding with
repairs
•Confirm electrical and
gas safe conditions
before proceeding with
repairs
•Confirm electrically safe
condition before
proceeding with repairs
•Confirm electrically safe
condition before
proceeding with repairs