HVACopediaGlow Brand · Boiler
Err 107 Internal software error (blocking)
What the control is telling you
Internal control error shown as a blocking error.
Applies to: B85, B120, B160 (NG and LP)
Likely causes
- Control board glitch
- Faulty ICB or display board
Test and repair steps
- Cycle power and press RESET.
- If it keeps returning, replace the ICB and the display board.
Settings for these units
Maintenance intervals · Glow B85/B120/B160
| Item | When |
|---|---|
| Annual inspection by a technician | Every year (warranty) |
| Relief valve try-lever test | Annually |
| LWCO test | Annually |
| Condensate trap clean | Annually (14.3) |
| Heat exchanger combustion-side wash | Annually or when combustion drifts (14.4) |
| Burner door silicone gasket | Replace if damaged or after 2 years |
| Service reminder | 2.203 on, interval 2.204 (default 1000 days) |
Operating pressure should sit 5 psi under the relief valve rating (max 25 psig on a 30 psi valve); water never above 180 F.
Models that show this code
3 models in Glow B85/B120/B160
Other codes on the same units
- Err 103 Internal software error (blocking)
- Err 104 Internal software error (blocking)
- Err 105 CH supply over 180 F (82 C)
- Err 106 Internal software error (blocking)
- Err 108 Internal software error (blocking)
- Err 109 Internal software error (blocking)
- Err 110 Internal software error (blocking)
- Err 111 Internal software error (blocking)
Save it for the next call
Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.
Source: Glow Brand B85/B120/B160 Installation & Operation Manual V20231025, Table 12.2 p.64. Summarized in our own words; check the original manual for your model.
Homeowner looking at this code? See what it means for you and when to call a technician.
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.