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Majestic · Gas fireplace troubleshooting

Millivolt: pilot lights but will not stay lit

DVBL7 Millivolt

What is going on

Pilot burns while the knob is held in but goes out when released.

Likely causes

  • Weak thermocouple
  • Bad gas valve

Check in this order

  1. Make sure the flame wraps the thermocouple; clean or adjust the pilot
  2. Check thermocouple is fully inserted and tight at the valve
  3. Disconnect the thermocouple, meter its tip to the copper lead with the pilot running and the knob held in: below 15 mV replace the pilot assembly
  4. Above 15 mV and still dropping out replace the valve

Applies to: 400DVBLN/PV7, 500DVBLN/PV7 (millivolt)

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Source: Majestic DVBL7 Series Installation and Operating Instructions, p. 46. Written in our own words; check the manual for your exact model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.