Maytag Amana SXV9 Series Service And Troubleshooting page 98

Troubleshooting
Error Code:
74 - Gas side thermistor
abnormality
Applicable Models:
DV**FEC
DV**PEC
CAPE(A)
CHPE
Method of Error Detection:
Check indoor thermistor
resistance value (X15A,1 and 2
pin)
Error Decision Conditions:
Open or short circuit of the
thermistor (When thermistor
detected continuous 20 seconds
about less than -43.6C (146.48F)
or more than 165C (329F). or
when output DCV is about less
than 0.04 VDC.) (When thermistor
resistance less than 309 ohm or
more than 1.7 M ohm)
98
Board reads
74 on the
display
Indoor gas
thermistor not
Yes
connected? (Control
board and junction
connector)
No
Incorrect
Yes
wiring to gas
thermistor?
No
Wrong
Yes
resistance
value of gas
thermistor?
No
Error Code - 74
Connect the gas thermistor
Correct wiring to gas thermistor
Replace gas thermistor
Replace control board