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NO
YES
R
eplace I/O Contr
ol
Boar
d. (page 39)
Correct wiring.
NO
YES
YES
22
DIAGNOSING AN ISSUE
Troubleshooting:
F8: HEAT LOW
YES
NO
Is the Hi-Limit
Thermostat tripped?
Is the Blower Motor blowing air?
YES
Reset and
determine why it
tripped – excess
grease buildup, etc.
(Figure 25, page 20)
NO
See page 17
to troubleshoot
F1: BLOWER
(Blower Running
Status Bad)
NO
Is the Solid S
tate R
elay
defective?
Is the Heater
Element defective?
Replace defective
heater
. (page 54)
Verify Solid State
Relay is not shor
ted
across output.
Replace SSR.
(page 40)
Is wiring from SSR to
I/O Contr
ol Boar
d OK?
(See page 61 for
schematic.)