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Glow Brand · Boiler troubleshooting

Blank display

C95 & C140C95 & C140 Combi

What is going on

If the screen on your C95 or C140 is dark, start with the simple stuff. Is it getting power at all? The ICB, the main control board, has an LED that tells you whether it is alive, and that splits the problem in two: no power to the board, or a good board with a bad link to the display.

Likely causes

  • No power at the plug or the breaker is off
  • Blown 5 A, 250 V fuse on the ICB
  • Loose or damaged wiring between the ICB and the display

Check in this order

  1. Turn off power before opening the unit.
  2. Confirm the unit is plugged in and the breaker is on.
  3. Check that the LED on the ICB is lit. If not, check the fuse on the ICB (5 A, 250 V, same part only).
  4. If the fuse is blown, look for the cause before replacing it, such as a pinched wire.
  5. If the LED is lit, check the wiring from the ICB to the display.

Applies to: C95, C140 (NG and LP)

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Source: Glow Brand C95 & C140 Installation & Operation Manual V.01282025 , Sec. 13.2 p.72. 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.