500DVBNVSL Gas Fireplace Parts

Majestic 500DVBNVSL

Find replacement parts, manuals, troubleshooting help, and compatibility information for the Majestic 500DVBNVSL Gas Fireplace.

Model Information

Majestic 500DVBNVSL is a Gas Fireplace configured for Natural Gas with a Millivolt ignition/control type using the Sit Mv control system. DVB SL Series.

Before ordering parts for this model, confirm the exact model number, gas type, ignition/control system, and serial number range. Some replacement parts may vary by gas type, control system, production date, or model notes.

Common Replacement Parts

Common replacement parts for this model may include pilot assemblies, gas valves, ignition modules, remotes, switches, blowers, or other service parts depending on the exact configuration.

Downloads

Manual

Parts List

Sit Millivolt Troubleshooting Wizard

Control System: Sit Millivolt

Interactive diagnostic guide for this fireplace system.

{"start":"sit_mv_start","steps":{"sit_mv_start":{"title":"SIT Millivolt Troubleshooting","question":"What problem are you having with this SIT millivolt system?","help":"SIT millivolt standing pilot systems use a pilot assembly with a thermocouple for pilot safety and a thermopile to generate millivolts for the main valve circuit. Choose the symptom that best matches the fireplace behavior.","professionalHelp":"This guide involves gas, pilot flame, thermocouple, thermopile, valve, and live gas testing. If you are not qualified to service gas appliances, stop and request professional help.","showContactForm":true,"stop":false,"options":[{"text":"Pilot will not light","next":"sit_mv_pilot_no_light","pathText":"Pilot will not light","showContactForm":true},{"text":"Pilot lights but will not stay lit","next":"sit_mv_pilot_wont_stay_lit","pathText":"Pilot will not stay lit","showContactForm":true},{"text":"Pilot stays lit but burner will not turn on","next":"sit_mv_pilot_lit_no_burner","pathText":"Pilot stays lit but burner will not turn on","showContactForm":true},{"text":"Burner comes on from switch/remote but is weak or unreliable","next":"sit_mv_switch_remote_issue","pathText":"Switch or remote issue","showContactForm":true},{"text":"Sooting or poor flame appearance","next":"sit_mv_sooting","pathText":"Sooting or poor flame appearance","showContactForm":true}]},"sit_mv_pilot_no_light":{"title":"Pilot Will Not Light","question":"The pilot will not light.","help":"For the pilot to light, the system needs fuel, oxygen, and ignition. Verify the gas shutoff valve is open and that gas is reaching the pilot. If air is in the gas line, the pilot may not light until the line is purged.Check the pilot tube and pilot orifice for blockage. If there is no spark at the pilot hood, verify the piezo ignitor is grounded, the electrode wire is connected, the ceramic is not cracked, and the electrode gap is approximately 1/8 inch.If fuel is present, the electrode gap is correct, and there is still no spark, the piezo ignitor may need replacement.","professionalHelp":"Pilot lighting and gas-line checks should be performed by a qualified service technician.","showContactForm":true,"stop":true,"options":[]},"sit_mv_pilot_wont_stay_lit":{"title":"Pilot Lights But Will Not Stay Lit","question":"The pilot lights while holding the knob in, but goes out when released.","help":"The pilot flame should engulf the top 3/8 inch of the thermocouple. If the flame is too small or not centered on the thermocouple, adjust the pilot flame at the SIT valve pilot adjustment.If the pilot flame cannot be adjusted, check inlet pressure. Minimum inlet pressure should typically be 4.5 inches W.C. for natural gas and 11.0 inches W.C. for LP. If pressure is correct, check for the correct pilot orifice and a bent or restricted pilot tube.Confirm the thermocouple is installed tightly into the valve. It should be hand tight plus approximately 1/4 turn. Do not overtighten.If the pilot flame is correct and the thermocouple is tight, test thermocouple output. With the pilot lit, 15 mV or more indicates the valve is bad. Less than 15 mV indicates the thermocouple is bad.","professionalHelp":"Thermocouple and valve testing should be performed by a qualified service technician.","showContactForm":true,"stop":true,"options":[]},"sit_mv_pilot_lit_no_burner":{"title":"Pilot Stays Lit But Burner Will Not Turn On","question":"The pilot stays lit, but the main burner will not come on.","help":"On an SIT millivolt system, the thermocouple keeps the pilot valve open, but the thermopile powers the main burner circuit. If the pilot stays lit but the burner will not turn on, the problem is not usually the thermocouple.With the pilot lit and the ON/OFF rocker switch in the OFF position, measure DC millivolts between TP and THTP on the SIT valve. The reading should be at least 325 mV. If the reading is below 325 mV, replace the thermopile.If thermopile output is good, remove the wires from the valve operator and check resistance between TH and TP. The SIT valve should read approximately 2.25 ohms, plus or minus 0.5 ohms. If outside that range, replace the valve.","professionalHelp":"Millivolt and valve resistance testing should be performed by a qualified service technician.","showContactForm":true,"stop":true,"options":[]},"sit_mv_switch_remote_issue":{"title":"Wall Switch, Thermostat, or Remote Issue","question":"The pilot is lit, but the burner does not respond correctly to the wall switch, thermostat, or remote.","help":"First confirm thermopile output and valve resistance are correct. Then inspect the wall switch, thermostat, remote receiver, and low-voltage wiring.With the wall switch ON, measure DC millivolts between TH and THTP. The reading should be less than 80 mV. If it is higher than 80 mV, disconnect the wall switch or remote wiring and test again. If the burner comes on, check wire gauge, wire length, wire connections, and the switch or remote receiver.Wall switch runs should generally use 18 AWG minimum wire and should not exceed the manufacturer-recommended length.","professionalHelp":"Low-voltage switch and remote diagnosis should be performed by a qualified technician.","showContactForm":true,"stop":true,"options":[]},"sit_mv_sooting":{"title":"Sooting or Poor Flame Appearance","question":"The fireplace is sooting, burning dirty, or has poor flame appearance.","help":"Sooting is commonly caused by incorrect manifold pressure, incorrect orifice size, improper air shutter setting, blocked or incorrect venting, burner misalignment, excessive ember material, poor log placement, or a glass seal issue.Natural gas manifold pressure is commonly 3.5 inches W.C. and LP is commonly 10.0 inches W.C., but always verify against the rating plate and installation manual. Do not guess — use a manometer.Confirm the burner is seated tightly on the orifice, the correct burner and orifice are installed for the fuel type, and the log placement matches the appliance manual. Incorrect rock wool or ember placement can also cause sooting.","professionalHelp":"Sooting can create carbon monoxide risk. Gas pressure and combustion issues should be checked by a qualified technician.","showContactForm":true,"stop":true,"options":[]}}}