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ELECTRONIC CONTROL LOGIC FLOWCHART
Figure 36. Control Logic Flowchart.
GENERAL - HEATER WILL NOT FIRE
If there is no electrical power, it may be that the home "circuit breaker" has tripped. Try re-setting it.
If there is electrical power but the heater will not fire check the following:
1. The time clock must be in the "ON" position.
2. The pump strainer basket may be full. If so remove debris.
3. The filter may be dirty. If so, backwash or clean filter. (To tell if the filter is dirty, look to see if the filter pressure will be high-
er than usual).
4. The pump may have lost its prime and be running dry. Check the pressure on the filter. If there is no pressure; then there is
not enough moving water (or the gauge is broken). Try to get the pump to run at its normal flow rate.
Turn knob to a
desired temperature
zone.
Yes
Yes
Yes
No
No
No
Turn switch ON.
After (6)
seconds, does
the igniter
spark?
Does the
burner tray
light?
Does the
burner tray
stay lit?
START
END
•Check water flow. Pressure switch is set for 1.75 PSI.
•Turn knob counterclockwise (setpoint may be lower
than actual temperature)
•Check High Limit. Both are normally closed.
•Check Roll-Out switch. Must be normally closed.
•Check wiring in control box against wiring diagram.
Ensure the heater is OFF. Attempt each step individually and
manually restart the heater after each attempt.
•Check gas line. There may be some air in the system.
•Make sure high tension wire is not grounding out to metal
or other voltage wire.
•Make sure high tension wire is properly connected to the
igniter.
•Check the gas valve. There must be 24VAC while the ignition
module is sparking.
•Check the igniter. Igniter may not be sensing correctly.
Check that the spark plug gap is ~.18”.