Monessen Hearth BTU/Hr - Manual (Page 23)

22 49D0090 49D0090 23
TROUBLESHOOTING
REMEDY
1. Replace pilot
2. Replace pilot
3. Reconnect ignitor cable
4. Free ignitor cable if pinched by any metal
or tubing. Keep ignitor cable dry
5. Replace ignitor cable
6. Replace piezo ignitor
1. Turn on gas supply or open equipment
shutoff valve
2. Turn control knob to PILOT position
3. Press in control knob while in PILOT
position.
4. Continue holding down control knob. Repeat
igniting operation until air is removed
5. Contact local gas company
6. Clean ODS/pilot (see “Cleaning and
Maintenance,” page 26) or replace ODS/
pilot assembly
7. Replace gas regulator
1. Press in control knob fully
2. After ODS/pilot lights, keep control knob
pressed in 30 seconds
3. Wait one minute for safety interlock
system to reset. Repeat ignition operation
4. Fully open equipment shutoff valve
5. Hand tighten until snug, then tighten 1/4
turn more
6. A) Contact local gas company
B) Clean ODS/pilot (see “Cleaning and
Maintenance,” page 26) or replace ODS/
pilot assembly
7. Replace thermocouple
8. Replace control valve
POSSIBLE CAUSE
1. Ignitor electrode positioned wrong
2. Ignitor electrode broken
3. Ignitor electrode not connected to ignit-
or cable
4. Ignitor cable pinched or wet
5. Broken ignitor cable
6. Bad piezo ignitor
1. Gas supply turned off or equipment shutoff
valve closed
2. Control knob not in PILOT position
3. Control knob not pressed in while in
PILOT position
4. Air in gas lines when installed
5. Depleted gas supply
6. ODS/pilot is clogged
7. Gas regulator setting is not correct
1. Control knob not fully pressed in
2. Control knob not pressed in long enough
3. Safety interlock system has been triggered
4. Equipment shutoff valve not fully open
5. Thermocouple connection loose at control
valve
6. Pilot flame not touching thermocouple, which
allows thermocouple to cool, causing pilot
flame to go out. This problem could be
caused by one or both of the following:
A) Low gas pressure
B) Dirty or partially clogged ODS/pilot
7. Thermocouple damaged
8. Control valve damaged
OBSERVED
PROBLEM
When ignitor button
is pressed, there is no
spark at ODS/pilot
When ignitor button
is pressed, there is
spark at ODS/pilot but
not ignition
ODS/pilot lights but
flame goes out when
control knob is released
Note: All troubleshooting items are listed in order of operation.
turn off and unplug heater and let
cool before servicing. Only a qualified
service person should service and
repair heater.
W
ARNING
Never use a wire, needle, or similar
object to clean ODS/pilot. This can
damage ODS/ pilot unit.
CAUTION
Continued