Bosch Greenstar combi 100 p Installation And Service Instructions For Contractors page 57

Display Description
d3 Temperature high limit defective.
External guard has tripped.
Temperature limiter locked out.
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.
E2 Supply temperature sensor defective.
E3 Additional supply temperature sensor defective.
E9 Heat exchanger safety high limit or flue gas temperature
limiter has tripped.
EA No flame detected.
GFA: Safety time expired.
F0 Internal fault
F1 Internal data error.
F7 Flame detected even when burner is off.
Greenstar combi 100 p / 151 p
Elimination
▶ 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).
▶ 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.
▶ Check temperature sensor and leads for interruptions or shorts, and
replace if defective.
▶ Check temperature sensor and leads for interruptions or shorts, and
replace if defective.
▶ 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.
▶ 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.
▶ 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.
▶ Reset boiler to the factory default setting ( service function 8.E).
▶ Check electrodes; replace if defective.
▶ Check flue gas system; clean or repair if defective.
▶ Check PCB for moisture; dry if needed.
Faults | 57
6720872361 (2017/04)