HTP · Boiler

CASCADE NO SENSOR Cascade - no system sensor

Normal status Elite EL

What the display is showing

Master has no system temperature sensor connected, or the sensor is defective.

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

Good to know

System sensor missing or defective.

What to do

Connect or repair the system sensor
All boilers run together instead of staging until it is fixed

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

F20 Condensate full
F31 Program error
CASCADE MASTER READY Cascade master ready
CASCADE NO FOLLOWER Cascade - no follower
DHW Temperature blocking - DHW demand
FL Low water flow
FLU High flue pressure
FOU Outdoor sensor fault

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Source: Elite EL-80 N Installation Manual (LP-293), p. 63, p. 64. 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.