Burner Troubleshooting; Heat Exchanger Troubleshooting; Operator Control Panel Displays Rnc Code - Pentair ETi 400 Installation And User Manual

Section 3: Troubleshooting
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Burner Troubleshooting

SYMPTOM
Loud, high-pitched whine
Flame is "fluttery ."
Exhaust may have acrid
smell or burner may fail
to stay lit.
Burner pulsates or
surges, especially on
ignition.
Combustion appears
normal, but flame does
not stay lit.

Heat Exchanger Troubleshooting

SYMPTOM
Boiling in heat exchanger.
May be accompanied by
"bumping" sounds.

Operator Control Panel Displays RNC Code

SYMPTOM
Operator control panel LCD displays .
the RNC code.
ETi 400 High Efficiency Pool and Spa Heater Installation and User's Guide
CAUSE
Flame is too rich.
Flame is too lean.
Exhaust vent is too long.
Flame current is not
being sensed.
CAUSE
.
Low water flow to heater
Heat exchanger plugged.
Bypass valve stuck open.
CAUSE
Neutralizer maintenance reminder.
The RNC code is displayed on the
LCD to remind you to do the
maintenance on the neutralizer
cartridge.
REMEDY
Verify pressure tap between gas valve
and blower inlet.
See page 16 and verify that the gas
regulator setting is –0.2" (–0.5cm) wc.
Contact a qualified technician or service
agency to replace the gas orifice.
See page 16 and verify that the gas
regulator setting is –0.2" (–0.5cm) wc.
Contact a qualified technician or service
agency to replace the gas orifice.
Reduce length of exhaust vent and/or
number of elbows.
Check for wet or damaged igniter with
low resistance to ground. Replacewith
new igniter.
Verify burner flameholder is properly
grounded.
Replace Ignition Control Module.
REMEDY
Service pump and or filter.
Service heat exchanger. Correct water
chemistry.
Service bypass valve.
REMEDY
To clear this code, press the OFF button .
to put the heater in off mode, then press
and hold the OFF button for 5 seconds.
Contact a qualified technician or service
agency to service the condensate
neutralizer cartridge.
Rev. C 4/2017