Troubleshooting Instructions - Mr. Heater MH9BX Operating Instructions And Owner's Manual

Troubleshooting Instructions

Problem
If Spark electrode does not produce
spark.
If Spark electrode produces spark but
pilot does not light.
is released.
If Main burner does not ignite.
If Heater keeps shutting "OFF" during
normal operation.
Check spark electrode; if defective, replace ODS
(Oxygen Depletion Sensor).
Check igniter wire is correctly attached to spark
electrode.
Check igniter wire; if damaged, replace.
Check piezo igniter; if defective, replace control
valve.
No gas to heater – install disposable c
connect hose and lter where required and turn
on valve at remote c
Check if " PILOT" position is properly aligned – turn
gas control knob to "
Check is pilot is blocked from spider web or dirt –
clean pilot, see MAINTENANCE.
Check if control knob in "
not completely depressed or held in long
enough to purge air from lines.
pilot, see MAINTENANCE.
Check if pilot assembly is defective – replace.
Check if tip switch wires are disconnected – connect.
burner, see MAINTENANCE.
Check if pilot is blocked – clean pilot, see
MAINTENANCE.
Tip over switch may have been activated from
bumping heater. Re-light.
Check if regulator is defective - Replace regulator.
Check for internal contamination - Replace control
valve and regulator.
Call Technical Services for additional information.
Remedy
.
PILOT" position and depress.
PILOT" position
or