Faults | 57
6720872361 (2017/04)Greenstar combi 100 p / 151 p
d3 Temperature high limit defective.
External guard has tripped.
Temperature limiter locked out.
▶ Check temperature sensor and leads for interruptions or shorts, and
replace if defective.
▶ Temperature guard TB1 has tripped. Check if jumper across 8-9 or PR-P0
is missing.
▶ Reset external temperature limiter (if installed).Reset LWCO (if installed).
▶ Reset pressure regulator (if installed).
d5 External supply temperature sensor defective (low-loss
header).
The external supply temperature sensor was recognized
on the BUS and then reconnected to the appropriate
terminal.
▶ Check temperature sensor and leads for interruptions or shorts, and
replace if defective.
▶ Check whether only one temperature sensor is connected; otherwise
remove second temperature sensor.
▶ Reset the boiler to the factory default settings ( service function 8.E),
reset the IPM 2 (if installed) to the factory default settings and carry out the
automatic system configuration.
E2 Supply temperature sensor defective. ▶ Check temperature sensor and leads for interruptions or shorts, and
replace if defective.
E3 Additional supply temperature sensor defective. ▶ Check temperature sensor and leads for interruptions or shorts, and
replace if defective.
E9 Heat exchanger safety high limit or flue gas temperature
limiter has tripped.
▶ Check flue gas safety high limit and leads for interruptions or shorts, and
replace if defective.
▶ Check heat exchanger safety high limit and leads for interruptions or shorts,
and replace if defective.
▶ Check the operating pressure.
▶ Check temperature limit; replace if defective.
▶ Check pump capacitor; replace pump if defective.
▶ Check PCB fuse, replace if blown (6.3 A fuse according to IEC default).
▶ Purge the appliance
▶ Check heat exchanger on the DHW side; replace if clogged.
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 condensate trap.
▶ Remove diaphragm at fan inlet connection and check for contamination or
cracks.
▶ Check heat exchanger for soiling ( Chapter 14.1.6, page 51).
▶ Check gas valve; 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.
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