Desa Comfort Glow CGN20TA Owner's Operation And Installation Manual

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Desa Comfort Glow CGN20TA Owner's Operation And Installation Manual Manual pdf 14 page image

14104190Blue Flame Vent-Free Natural Gas HeaterCGN20TATROUBLESHOOTINGNote: All troubleshooting items are listed inorder of operation.WARNING: Turn off and un-plug heater and let cool beforeservicing. Only a qualified ser-vice person should service andrepair heater.CAUTION: Never use a wire,needle, or similar object to cleanODS/pilot. This can damage ODS/pilot unit.POSSIBLE CAUSE1. Ignitor electrode positioned wrong2. Ignitor electrode broken3. Ignitor electrode not connected to igni-tor cable4. Ignitor cable pinched or wet5. Piezo ignitor nut is loose6. Broken ignitor cable7. Bad piezo ignitor1. Gas supply turned off or manual shutoffvalve closed2. Control knob not in PILOT position3. Control knob not pressed in while in PI-LOT position4. Air in gas lines when installed5. ODS/pilot is clogged6. Gas regulator setting is not correct1. Control knob not fully pressed in2. Control knob not pressed in long enough3. Safety interlock system has been trig-gered (Thermostat models only)4. Manual shutoff valve not fully open5. Thermocouple connection loose at con-trol valve6. Pilot flame not touching thermocouple,which allows thermocouple to cool,causing pilot flame to go out. This prob-lem could be caused by one or both ofthe following:A) Low gas pressureB) Dirty or partially clogged ODS/pilot7. Thermocouple damaged8. Control valve damagedREMEDY1. Replace ignitor2. Replace ignitor3. Reconnect ignitor cable4. Free ignitor cable if pinched by anymetal or tubing. Keep ignitor cable dry5. Tighten nut holding piezo ignitor toheater cabinet. Nut is located insideheater cabinet at top6. Replace ignitor cable7. Replace piezo ignitor1. Turn on gas supply or open manualshutoff valve2. Turn control knob to PILOT position3. Press in control knob while in PILOTposition4. Continue holding down control knob.Repeat igniting operation until air is re-moved5. Clean ODS/pilot (see Cleaning andMaintenance, page17) or replace ODS/pilot assembly6. Replace gas regulator1. Press in control knob fully2. After ODS/pilot lights, keep controlknob pressed in 30 seconds3. Wait one (1) minute for safety interlocksystem to reset. Repeat ignition operation4. Fully open manual shut-off valve5. Hand tighten until snug, then tighten 1/4turn more6. A) Contact local natural gas companyB) Clean ODS/pilot (see Cleaning andMaintenance, page 17) or replace ODS/pilot assembly7. Replace thermocouple8. Replace control valveOBSERVED PROBLEMWhen ignitor button is pressed, there is nospark at ODS/pilotWhen ignitor button is pressed, there isspark at ODS/pilot but no ignitionODS/pilot lights but flame goes out whencontrol knob is released