Frank FH 711 TS Operating Instructions Manual page 36

Trouble
Burner fails to switch
on or switches off
during operation
Burner fails to light or
only with difficulty, bur-
ner is sooting, burner
causes inadmissible
emissions
Heating performance
of the water heater
too low
Possible cause
Lack of water
Lack of fuel oil
Wrong burner nozzle
Burner nozzle dirty
No spark
Electrodes not in correct posi-
tion; sparks may reach burner
nozzle or baffle
Faulty fuel oil preheater
Solenoid valve fails to open
Regulating thermostat does not
work
Air values not correct
Combustion chamber or hea-
ting oil contaminated
Burner settings incorrect
Combustion chamber or hea-
ting coil contaminated
Heating coil coated with lime
What to do about it
Provide sufficient water supply
Refill fuel oil
Have an expert replace or clean
burner nozzle resp., (see also
6.4.2 and special dimensioned
drawing incl. technical specifi-
cations).
Have an expert check ignition
transformer and cable; replace
if necessary
Have an expert adjust elec-
trodes (see special dimensi-
oned drawing)
Have an expert replace fuel oil
preheater
Have an expert check solenoid
valve, and replace if necessary
Have an expert check regula-
ting thermostat, and replace if
necessary
Have an expert adjust air
throttle (see also special dimen-
sioned drawing)
Have an expert clean heating
coil (see also 6.3)
Have an expert adjust the
correct values on burner (see
special dimensioned drawing)
Have an expert clean heating
coil (see also 6.3)
Have an expert delime heating
coil (see also 6.2)
36