John Wood Superflue Power Vent (75 Gallon) - Manual (Page 34)

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STEP CHECK THAT: POSSIBLE PROBLEM CORRECTION
11. Gas valve opens, main burner
comes on - Poor electrical connection on
control
- Flashing red LED light from:
insufficient gas pressure
- flame rod out of position
- flame rod oxidized (low signal) or
broken (no signal)
- Safety shut down by pressure
switch or high limit switch.
Blower continues to run but
heater will not operate
- Check power supply and termi-
nal connections
- Correct gas supply and burner
manifold pressures
- Reposition rod (rod tip should be
level with or slightly above the
top of the burner)
- Unplug flame sensor wire and
connect micro amp meter.
Current should be greater than
0.7 micro amps. Remove oxida-
tion (if present) with steel wool.
Replace rod if broken or signal
insufficient.
- See above information on pres-
sure switch or high limit switch
- Check for debris that have may
entered combustion chamber or
venting