Midco Economite RE6850B - Manual (Page 16)

Midco International Inc. 4140 West Victoria Street * Chicago, Illinois 60646
tel 773.604.8700 fax 773.604.4070 web www.midcointernational.com email [email protected]
TROUBLE CHART
Make sure the thermostat and operating controls are calling for heat.
CAUTION: If a test indicates an electrical component may be defective,
before replacing it, make sure that its associated wiring is not at fault.
ELECTRICAL AND FLAME CHECKS MUST BE MADE IN THE ORDER LISTED BELOW.
I. MOTOR WILL NOT RUN
A.
Confirm 120V between strip terminals L1 and L2 and verify the circuit polarity and
electrical ground between strip terminal L1 and burner Ground.
B. Check for 120V between strip terminals L1 and L2.
1. No voltage, open circuit in operating controls.
2. Voltage present, motor is defective.
II. MOTOR RUNS CONTINUOUSLY, PILOT WILL NOT LIGHT
A.
Confirm that ALL Main Manual Shut-Off Valves are in the ON position.
B. After the pre-purge, if the pilot flame is not proven within the pilot flame
re-establishing period, or if the proof of flame is lost during the burner run and the
pilot is not re-established after the pre-purge, the Ignition Control Module will lock
out. RESET the 24 volt ignition Control Module by setting the operating control to
OFF or the thermostat below room temperature for at least 30 seconds. RESET the
120 volt RM7895 control by pushing its reset button. See Section XII.
C. Clogged pilot orifice.
D. Pilot regulator mis-adjusted or defective.
E. Defective spark electrode, Ignition Control Module or Transformer for 120V.
F. Defective high tension wire.
G. Wrong pilot orifice.
H. Defective pilot valve.
I. Pilot air tube clogged.
J. Incorrect spark gap.
K. Pilot regulator vent clogged.
L. Defective blower air switch.
M. Step down transformer is defective, (if applicable).
N.
Insufficient pilot flame sensing signal.
III PILOT LIGHTS, NO MAIN FLAME
A.
Poor pilot flame adjustment.
B. Clogged pilot air tube.
C. Defective flame sensing rod or wire.
D. Flame sensing rod mis-located.
E. Pilot regulator vent clogged.
F. Defective Ignition Control Module, if applicable.
G. Defective main gas valve.
H. Low gas pressure.
I. Grossly mis-adjusted main gas and air mixture.
J. Insufficient pilot flame sensing signal.
1007
8471 45
Printed in USB
I Motor Will
Not Run or Motor
Runs in Repeated
Cycles
II Motor Runs
Continuously, But
No Flame
III Pilot Lights,
No Main Flame
Trouble Chart
Part 3 Maintenance
Part 3 Maintenance
Continued