Glow Brand · Boiler

FILL Low water pressure prompt

Normal status Glow B85/B120/B160

What the display is showing

Shown together with Err 116 or Err 162 when the CH loop pressure is too low. Fill the system to about 16 psi.

Applies to: B85, B120, B160 (NG and LP)

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

B120B160B85

Other codes on the same units

Err 130 Flue temperature sensor shorted
Err 134 Too many resets in a short time
Err 156 Blocked flue switch open
Err 162 Low water pressure under 10 psi (FILL)
Loc Lockout prefix
Loc 0 Internal software fault
Loc 1 Ignition failed three times in a row
Loc 10 Wrong safety parameters in EEPROM

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Source: Glow Brand B85/B120/B160 Installation & Operation Manual V20231025, 12.2 p.64-65. Summarized in our own words; check the original manual for your 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.