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POSSIBLE CAUSES
Central heating pressure is too low.
The flue is blocked.
5.4.6 Burner ignites loudly
POSSIBLE CAUSES
Inlet pressure is too high.
Ignition distance is incorrect.
Gas-air control is not correctly
adjusted.
5.4.7 Burner resonates
POSSIBLE CAUSES
Gas inlet pressure lower than 5" w.c.
or sometimes disappears.
There is recirculation of flue gases.
Gas-air control is not correctly adjusted.
Burner seal is defective.
Burner is defective.
5-10
SFC BOILER / WATER HEATERS - SFC 199
ANALYSIS
POSSIBLE SOLUTION
→ Yes
Top off the central heating system until the central heating
pressure is between 14.5 and 29 psi (1 and 2 bar).
↓No
→ Yes
Check the flue.
ANALYSIS
→ Yes
↓No
→ Yes
↓No
→ Yes
ANALYSIS
→ Yes
↓No
→ Yes
↓No
→ Yes
↓No
→ Yes
↓No
→ Yes
SOLUTION
The home pressure regulator may be defective. In that
case, contact the energy company.
Replace the ignitor including the ignition cable.
Check and/or replace the ignition cable.
Replace the ignition unit in the top cover.
Replace the ignitor.
SOLUTION
The home pressure regulator may be defective. Contact
the energy company.
Check the flue and air supply duct.
Check the adjustment
Replace the burner seal.
Replace the burner.
INSTALLATION AND OPERATION INSTRUCTIONS
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