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HTP · Boiler troubleshooting

Thermostat calling but boiler not firing

Elite EL

What is going on

Call for heat present but no burner.

Likely causes

  • Supply water already above set point minus differential (TT / DHW blocking)
  • Flue temperature high (E07)
  • Low water pressure (PRO)
  • Flue pressure switch (FLU)
  • Condensate full (F20)

Check in this order

  1. Read the message on the display and match it to the code list
  2. Check SUPPLY against CH set minus diff in the status menu
  3. Check there is no voltage across the thermostat terminals
  4. Check system pressure over 10 psig

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

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Source: Elite EL-80 N Installation Manual (LP-293), p. 66 to p. 68, p. 51. Written in our own words; check the manual for your exact 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.