Bosch T5600S 12 D 23 Training And Service Information page 43

the remaining safety valves and goes to lock.
If no leakage is detected, after the next water demand the
safety valves closing order is inverted.
Error is resolved by manual reset.
EC Ionization loss
With burner on, when ionization signal is lost 3 consecutive
times, the system will shut off.
Error is resolved by manual reset.
E8 Internal Checking Failure
Error is resolved by manual reset. If error persist replace
control unit.
F2 Solenoid valve drive circuit
Error is resolved by manual reset. If error persist replace
control unit.
F4 MCU PC (micro controller) instruction error
Error is resolved by manual reset. If error persist replace
control unit.
F5 Instructions compile and execution error
Error is resolved by manual reset. If error persist replace
control unit.
F6 MCU RAM DC (micro controller) internal error
Error is resolved by manual reset. Check if voltage is too
low (< 70 v ac). If voltage ok and error persist replace
control unit.
FP APS I/O short circuit error
Error is resolved by manual reset. If error persist replace
control unit.
F8 MCU ROM (micro controller) error
Error is resolved by manual reset. If error persist replace
control unit.
F9 MCU registration DC (micro controller) error
Error is resolved by manual reset. If error persist replace
control unit.
EH Remote controller removes the error code 5 times
continuously within 15mins.
Error is resolved by manual reset.
Fb Lock function self-check error (PCB internal error)
Error is resolved by manual reset. If error persist replace
control unit.
Bosch, Termotecnologia S.A
TT-DW/PRM-STI – International Training and Technical Support
Aveiro Plant - Portugal
Page 43 from 43
Table 21 – Error code list
6 720 887 547 "SM FP_ErP MPP Europe 2018/08 en"
Lock out
Lock out
Lock out
Lock out
Lock out
Lock out
Lock out
Lock out
Lock out
Lock out
Lock out