Heat & Glo Gas Fireplace: DSI fireplace: burner lights but will not stay lit

DSI fireplace: burner lights but will not stay lit on a Heat & Glo gas fireplace: The burner lights and then goes out because the module does not prove flame (flame rectification).

Homeowner with a gas fireplace problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Applies to: Heat-N-Glo DSI fireplaces: RAM 1MC1-01/-05, RAM-1-RS, Fenwal 24 VAC, CFX-DA, Grand-50-C

Common causes of dsi fireplace: burner lights but will not stay lit

• Reversed polarity at the junction box
• Junction box, module or burner not grounded
• Ignitor / flame sensor not in the flame
• Loose ignitor cable or flame sensor wire
• Flame too close to the ceramic insulator
• Open high-temperature limit (Fenwal units with one)
• Grate not installed (CFX-DA)

How to fix dsi fireplace: burner lights but will not stay lit: step by step

1. WARNING: Disconnect 110/120 VAC before changing wiring.
2. Check polarity: meter from 120 VAC HOT on the module to ground should read 110/120 VAC; from 120 VAC RTN to ground should read 0 V. If reversed, shut off power and swap hot and neutral at the junction box.
3. The junction box must be grounded, and the module/burner ground must be secure; ground leads must have no paint, oil or other insulation under them. The system works by flame rectification, which needs a good ground.
4. Adjust the bracket so the probe stays in the flame whenever the burner is lit. Flame too close to the ceramic insulator causes nuisance lockouts and electrode failure.
5. Check the ignitor cable connection. Fenwal: the yellow flame sensor wire must be on S1 at the module.
6. CFX-DA: the grate must be installed for the unit to work correctly.
7. RAM-1-RS: if polarity, grounding and probe position are all correct, replace the module.

If the unit shows an error code, look it up: Heat & Glo Gas Fireplace codes

Models

CFX-DAGrand-50-CRAM-1-RSRAM 1MC1-01RAM 1MC1-05