HVACopediaGlow Brand boiler error codes
62 codes (53 faults, 9 normal display and menu codes), plus 1 settings tables.
| Code | Meaning | Severity / type |
|---|---|---|
| ALEg | Anti-legionella run | Normal status |
| AttE | Warning prefix | Menu / mode display |
| AttE 202 | Unknown appliance model selected | Low |
| AttE 204 | Outdoor sensor open or shorted | Low |
| CodE | Installer password prompt | Menu / mode display |
| Err | Blocking error prefix | Menu / mode display |
| Err 100 | Internal software error (blocking) | Medium |
| Err 101 | Internal software error (blocking) | Medium |
| Err 102 | Internal software error (blocking) | Medium |
| Err 103 | Internal software error (blocking) | Medium |
| Err 104 | Internal software error (blocking) | Medium |
| Err 105 | CH supply over 180 F (82 C) | Medium |
| Err 106 | Internal software error (blocking) | Medium |
| Err 107 | Internal software error (blocking) | Medium |
| Err 108 | Internal software error (blocking) | Medium |
| Err 109 | Internal software error (blocking) | Medium |
| Err 110 | Internal software error (blocking) | Medium |
| Err 111 | Internal software error (blocking) | Medium |
| Err 112 | Internal software error (blocking) | Medium |
| Err 113 | Internal software error (blocking) | Medium |
| Err 114 | False flame detected | Medium |
| Err 116 | Low water pressure (FILL) | Medium |
| Err 119 | CH return temperature sensor open | Medium |
| Err 120 | CH supply temperature sensor open | Medium |
| Err 122 | DHW tank temperature sensor open | Medium |
| Err 123 | Flue temperature sensor open | Medium |
| Err 126 | CH return temperature sensor shorted | Medium |
| Err 127 | CH supply temperature sensor shorted | Medium |
| Err 129 | DHW tank temperature sensor shorted | Medium |
| Err 130 | Flue temperature sensor shorted | Medium |
| Err 134 | Too many resets in a short time | Low |
| Err 156 | Blocked flue switch open | Medium |
| Err 162 | Low water pressure under 10 psi (FILL) | Medium |
| FILL | Low water pressure prompt | Normal status |
| Loc | Lockout prefix | Menu / mode display |
| Loc 0 | Internal software fault | High |
| Loc 1 | Ignition failed three times in a row | High |
| Loc 10 | Wrong safety parameters in EEPROM | High |
| Loc 11 | Internal software fault | High |
| Loc 12 | Internal software fault | High |
| Loc 15 | High limit exceeded (203 F / 95 C) | High |
| Loc 16 | Flue temperature too high | High |
| Loc 17 | Internal software fault | High |
| Loc 18 | Internal software fault | High |
| Loc 19 | Internal software fault | High |
| Loc 2 | Gas valve relay fault | High |
| Loc 20 | Flame still present 10 s after gas valve closed | High |
| Loc 21 | Flame detected before ignition | High |
| Loc 22 | Three flame failures in one demand | High |
| Loc 23 | Error code memory corrupted | High |
| Loc 3 | Safety relay fault | High |
| Loc 33 | Low water cut-off circuit open | High |
| Loc 38 | Blocked flue switch tripped more than 3 times in 24 h | High |
| Loc 4 | Blocking error lasted over 20 hours | Medium |
| Loc 5 | Fan not running for more than 60 seconds | High |
| Loc 6 | Fan running too slow for more than 60 seconds | High |
| Loc 7 | Fan running too fast for more than 60 seconds | High |
| Loc 8 | Internal software fault | High |
| Loc 9 | EEPROM contents out of date | High |
| dAir | De-air sequence running | Normal status |
| init | Display starting up | Normal status |
| tESt | System test active | Normal status |
Settings and specs
Maintenance intervals
Maintenance · 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.
Source: Glow Brand B85/B120/B160 Installation & Operation Manual V20231025, 14.1-14.2 p.69
Models covered
B120B160B85
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.