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TROUBLE SHOOTING THE ML39 FIREPLACE & MAINTENANCE INFORMATION
SYMPTOM
PROBABLE CAUSES
CORRECTIVE ACTION
1. Thin black coating
(soot) forms on view-
ing glass.
A. Incorrect gas pres-
sure or improper orifice
size.
B. Not enough combus-
tion air. Air slots
blocked off.
Have gas supplier check for correct gas inlet pressure (7" W.C.
Nat. Gas; 11" W.C. LP Gas).
If sooting continues, open air shutter on burner (see "Gas
Flame Adjustment" below).
If sooting still continues, shut off unit and call Mendota service
person.
NOTE:
To clean glass - remove glass and wipe glass with
cloth or paper towel.
2. Humming or whis-
tling coming from
Fireplace.
A. Normal operating
noise.
Some noise is normal. It is caused by the gas supply flowing
through the gas orifice. It is expected from any gas fireplace.
Turning the Hi/Lo Knob on the control can reduce the noise.
Turning down the flame will reduce the heat output of the unit.
3. A change in flame
appearance or burner
operation.
A. A change in gas
pressure.
B. Vent system restrict-
ed.
Have your gas supplier check for correct gas 7" W.C. Nat. Gas;
11" W.C. LP Gas). If flame still needs adjustment see "Flame
Adjustment" below.
Clean out carbon, spider webs, lint, etc. from shutter area.
Logs and burner.
Check Vent Cap’s AIR INTAKE and Exhaust OUTLET ports.
Over Firing Of Burner
NEVER "over fire" units by adjusting gas pressure or drilling out the orifice to increase BTUH above nameplate specifica-
tions. Over firing can cause permanent damage to firebox and deterioration of parts and void warranty.
MAINTAINING CORRECT PILOT-FLAME, PILOT OUTAGE & RELIGHTING
The pilot flame must be checked during initial installation and annually by a qualified Mendota Technician. This appliance
utilizes Flame Rectification Technology. If the pilot flame is turned down too low, the flame sensor may not detect the pilot
flame and the pilot light may not stay lit. Do not turn down the pilot light flame. Use the IPI mode instead during summer
months.
Cleaning Viewing Glass
The viewing glass should be cleaned periodically. Exterior glass surface may be cleaned with cleaner as desired. To
clean interior surface of glass - use soap and water. CAUTION: Do not use oven cleaner to clean glass. Do not use any
type of abrasive cleaner. Clean the glass only when it has cooled to room temperature.
NOTE
: Additives that are put in gas (both natural and propane) to make it smell can be harmful to glass and can leave a
white film deposit on the glass. This deposit can be removed with cleaners such as KEL KEM “Polish Plus” (part # 65-06-
00455) or comparable product (contact your dealer).
In some cases (especially when burning propane) additives can cause “crazing” or etching of the glass. This is not a
common occurrence. However, any “crazing” or etching of the glass is not covered under the warranty. The solution may
be to change propane suppliers.
Sooting
Sooting is caused by improper installation of media, vent system or improper primary air shutter operation. However,
some small areas of soot deposits on media surfaces are deemed acceptable. If you observe signs of sooting on the door
glass (usually a thin black film on the Fireplace viewing glass or on the outside of the home around the vent cap), the unit
must be immediately turned off and the local Mendota dealer promptly informed. Mendota dealers will correct "sooting"
problems, but Mendota and their dealers are not responsible for damage caused by excessive sooting that has not been
immediately brought to their attention.
Operation During Power Failure
This fireplace is designed to operate during power outages. Blowers and the Accent Light will not function during power
outages. However, all burners will continue to function normally. Heat output will be reduced slightly without the blower
functioning (approximately 5% less).
Gas Shutoff Procedures
The planning and installing individual must plan for a local code approved Manual keyed gas shut off valve installation.
Consult with your installer about specific procedures about emergency gas shutoff.
