Troubleshooting On The G124X Sp - Buderus Logano G124X II/SP Installation And Maintenance Instructions Manual

Boiler inspection and maintenance

13.8 Troubleshooting on the G124X SP

Equipment required: Wiring diagrams (
Start
Set gas valve ON/OFF button
clockwise to OFF position.
Close main gas valve. Set
thermostat (control) to heat
requirement (vent damper
opens).
Switch on power.
Set gas valve ON/OFF button
counterclockwise to PILOT
position. Open main gas valve.
Press red reset button and ignite
ignition flame. Hold down red
reset button for one minute and
then release. Ignition flame is
burning.
Set gas valve ON/OFF button
counterclockwise to ON. Main
burner ignites.
System operates until the heat
requirement ends.
Heat requirement ended,
system switches off, vent
damper closes. Ignition flame
continues to burn.
End of troubleshooting
We reserve the right to make any changes due to technical modifications.
Installation and maintenance instructions Logano G124X II/SP special gas-fired boiler • Issue 04/2005
Chapter 16, page 74) and voltage detectors for 120 VAC and 24 VAC.
No
• Check electrical power supply, low-voltage transformer, thermostat
(control) and wiring. Check that the vent damper (if installed) is open and
the limit switch is present.
No
• • Check that all manually operated baffles are open; check that gas Check that all manually operated baffles are open; check that gas
connections and pressures are correct and that ignition gas nozzles are connections and pressures are correct and that main orifices are not
not blocked. blocked.
• • Check connections to gas fitting. Check connections to gas valve.
• • If the ignition flame goes out, check that the thermal element is firmly If the ignition flame goes out, check that the thermal element is firmly
screwed to the gas valves; if yes, replace thermal element. screwed to the gas valve; if yes, replace pilot assembly.
• • If the ignition flame continues to go out, replace gas valves. If the ignition flame continues to go out, replace gas valves.
No
• Check 24-V voltage at the gas valve.
• Check electrical connections to gas valve. If OK replace gas valve.
No
• Check that the ignition flame surrounds the thermocouple and burns
evenly with a bluish flame. If OK replace thermocouple.
No
• Check operation of thermostat (control).
• Disconnect 24-V connection to gas fitting. If gas valve closes, check
thermostat and connection line again.
• If the gas valve does not close, replace gas valve.
Repeat procedure until heating system operates correctly.
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