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Heat & Glo · Gas fireplace troubleshooting

HSI fireplace: flame comes on but will not stay lit

What is going on

The burner lights on a hot surface ignition unit but drops out.

Likely causes

  • Junction box or module not grounded
  • Reversed polarity
  • Ignitor/sensor not in the flame

Check in this order

  1. Ground the junction box and the module if either is not grounded.
  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. Reposition the ignitor bracket so the ignitor is in the flames over the port holes.

Applies to: Heat-N-Glo HSI fireplaces

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Source: Heat-N-Glo DSI / HSI Troubleshooting Guide (Professional Development), Section 7 HSI, p.54. 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.