Burner / Heat Exchanger Troubleshooting - Pentair MASTERTEMP 125 Guide D'installation Et D'utilisation

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Section 5. Troubleshooting
44
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.
Sweating.
MASTERTEMP 125 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.
Thermal governor stuck
closed.
Thermal governor failed.
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.
Replace
thermal governor.
Replace
thermal governor.
Rev. C 3/2019

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