Bosch Greenstar, Installation And Service Instructions Manual

Page: 78 / 104

78 | Faults
Greenstar 6 720 806 992 (2015/03)
EA No flame detected.
GFA: Safety time expired.
▶ Check that ground lead is properly connected, replace if defective.
▶ Check that gas cock is open.
▶ Check inlet gas pressure; correct if needed.
▶ Check power supply.
▶ Check electrodes for visual damage; replace if defective.
▶ Check flue gas system; clean or repair if defective.
▶ Check gas/air ratio; correct if out of range.
▶ Check gas valve; replace if defective.
▶ In room air operation, check air supply or ventilation apertures.
▶ Clean the condensate trap.
▶ Remove diaphragm at fan inlet connection and check for
contamination or cracks.
▶ Check heat exchanger for soiling (

Chapter 15.1.6, page 71).
▶ Check gas cock; replace if defective.
▶ Insert code plug correctly; replace if defective.
F0 Internal fault ▶ Press reset for 3 seconds and release. When the button is released, the
appliance will restart.
▶ Check electrical plug-in contacts and ignition leads; replace PCB if defective.
▶ Check gas/air ratio; correct if out of specification.
F1 Internal data error. ▶ Reset boiler to the factory default setting (

service function 8.E).
F7 Flame detected even when burner is off. ▶ Check electrodes; replace if defective.
▶ Check flue gas system; clean or repair if defective.
▶ Check PCB for moisture; dry if needed.
FA After switching gas off: Flame is detected. ▶ Check gas cock; replace if defective.
▶ Clean condensate trap.
▶ Check electrodes and leads; replace if defective.
▶ Check flue gas system; clean or repair if needed.
Fd Reset button pressed by mistake. ▶ Press reset button again.
▶ Check cable harness to safety high limit and gas cock for ground connection.
Temperature gradient limiter: Temperature rise
too fast ▶ Fully open service shut-off valves.
▶ Check electrical connection between heating zone pump and Heatronic.
▶ Check pump plug connection per installation instructions.
▶ Manually test operation of heating zone pump and replace if defective.
▶ Set pump speed correctly to match maximum output.
Display Description Elimination
Table 38 Faults shown on the display