General-Heater Will Not Fire; Electronic Control Logic Flowchart - Rheem Versa Heaters Instructions Manual

Electronic Control Logic Flowchart

Turn knob to a
desired temperature
Turn switch ON.
seconds, does
the igniter
Yes
burner tray
Yes
Does the
burner tray
Yes
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 pres-
sure will be higher than usual).
4. The pump may have lost its prime and be running dry. Check the pressure on the filter. If there is no pres-
sure; then there is not enough moving water (or the gauge is broken). Try to get the pump to run at its normal
flow rate.
START
zone.
•Check water flow. Pressure switch is set for 1.75 PSI.
After (6)
No
•Turn knob counterclockwise (setpoint may be lower
than actual temperature)
•Check High Limit. Both are normally closed.
spark?
•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.
No
Does the
•Make sure high tension wire is not grounding out to metal
or other voltage wire.
light?
•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.
No
•Check the igniter. Igniter may not be sensing correctly.
Check that the spark plug gap is ~.18" .
stay lit?
END
Fig. 37: Control Logic Flowchart
30