MT3255 and MT3270
5 --- 5
POSSIBLE CAUSE(S) SUGGESTED REMEDY
Symptom #2 --- Burner will not fire (computer controls)
D
Oven in OFF mode.
D
Emergency stop switch on OFF.
D
Control circuit breaker tripped.
D
Combustion motor not running.
D
Main Temperature Controller not set above ambi-
ent temperature.
D
Manual gas valve closed.
D
Intermittent Ignition Device (IID) system locked
out.
D
Air pressure switch may be open.
D
Blower motor(s) not running.
D
High Limit control tripped.
D
Thermal switch in control compartment tripped.
D
Excessive intake air temperature.
D
If pilot fails to go out when the unit is shut down,
the solenoid valve is bad.
D
Turn to ON position.
D
Pull switch out to ON.
D
Reset breaker.
D
Check transformer for primary and s econdary
voltage.
D
Check main control and burner valve relays to
see if closed.
D
Check relay in combustion burner box. If bad re-
place relay.
D
Set to desired temperature.
D
Open valve.
D
Reference Technical Appendix (page 6---1
t h r o u g h 6 --- 3 ) .
D
Check convection blower for proper operation.
D
V erify voltage to motor. If voltage is present, re-
placethemotororstartcapacitor.
D
Verify that 625_F (330_C) high limit is pro-
grammed into the controller. If so reset the high
limit. Set the computer to 500_F (260_C). Use a
pyrometer to verify the oven temperature. If the
oven climbs significantly above the setpoint, use
the chart in the Technical Appendix (page 6---4)
to check the probe. If the probe is alright the com-
puter may need replacement.
D
Check hood system.
D
Check hood system.
D
Replace valve.
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