HTP · Boiler

F31 Program error

High severity Elite EL

What the control is telling you

Control memory was corrupted while it was being programmed. Control will not run and the pump is off.

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

Likely causes

Programming interrupted during technician service
Failed control (if it happens at any other time)

Test and repair steps

Re-program the control
If re-programming does not fix it, replace the control

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

F10 Flame loss
F11 False flame signal
F13 Fan speed error
F20 Condensate full
CASCADE MASTER READY Cascade master ready
CASCADE NO FOLLOWER Cascade - no follower
CASCADE NO SENSOR Cascade - no system sensor
DHW Temperature blocking - DHW demand

Save it for the next call

Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.

Open the app

Source: Elite EL-80 N Installation Manual (LP-293), p. 72, p. 73. 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.