HTP · Boiler

PRO Low water pressure

Medium severity Elite EL

What the control is telling you

System water pressure is too low for the boiler to run; pump off. Resets automatically once pressure is restored.

Applies to: EL-80, EL-110, EL-150, EL-220, EL-299, EL-399 (N/LP)

Likely causes

System pressure below the minimum
Leak in the system piping

Test and repair steps

Confirm the system pressure is above 10 psig
Look for leaks in the piping and refill to proper pressure

Models that show this code

12 models in Elite EL

EL-110 LPEL-110 NEL-150 LPEL-150 NEL-220 LPEL-220 NEL-299 LPEL-299 NEL-399 LPEL-399 NEL-80 LPEL-80 N

Other codes on the same units

GAS VALVE ON / RUN Ignition then run status
LOCKOUT Lockout (display message)
LOU 24 volt supply low
MAINTENANCE REQUIRED Service reminder
PP Control programmed
SERVICE PUMP CH / DH / SH Pump service mode
SERVICE RUN Test mode running
TT Temperature blocking - thermostat (TT) demand

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Source: Elite EL-80 N Installation Manual (LP-293), p. 68. 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.