Glow Brand Boiler: Display normal but no heat to the space
Display normal but no heat to the space on a Glow Brand boiler: The boiler looks fine but the heating loop stays cold.
Applies to: B85, B120, B160 (NG and LP)
Common causes of display normal but no heat to the space
- No thermostat/end switch call on terminals 9-10
- Outdoor temperature above warm weather shutdown (2.025)
- Supply already above CH setpoint
- CH pump not running or not wired to 7-8
- DHW priority active
How to fix display normal but no heat to the space: step by step
- Make a call: the radiator icon flashes during a CH demand. If unsure about the thermostat, jumper terminals 9 and 10.
- No radiator icon: read outdoor temperature at 1.004 and compare with the warm weather shutdown (2.025); above it the boiler will not heat.
- Icon flashing but no fire: compare the main-screen supply temperature against the CH setpoint (0.003 / 2.003). The burner waits until supply drops below the setpoint by the differential. Raise 2.003 if it is too low.
- Make sure the CH pump runs and is wired to terminals 7 and 8.
- Radiator icon steady and faucet icon flashing means a DHW call has priority. If this lasts too long, raise the DHW setpoint or shorten the DHW priority time (2.043).
Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.
If the unit shows an error code, look it up: Glow Brand Boiler codes
Models
Source: Glow Brand B85/B120/B160 Installation & Operation Manual V20231025, 13.2.2 p.67. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.