Bosch Greentherm 9800 SEO 160 - Error Code Diagnostics E8-FA

6 720 817 281 (2017/05)Greentherm 9800 SEO 160/199 | SECO 199
Problem solving | 41
E8 Error during ionization test. Electronic control unit
internal error.
▶ Replace electronic control unit.
1)
E9 Thermal fuse [13] broken. ▶ Replace thermal fuse.
1)
EA Ignition failure. ▶ Check gas inlet pressure ( section 6.6).
1)
▶ Perform gas and air tuning ( section 10.11).
1)
EC Flame lost during operation. ▶ Check gas inlet pressure ( section 6.6).
1)
▶ Perform gas and air tuning ( section 10.11).
1)
EE Gas valve modulation solenoid [7] disconnected. ▶ Check gas valve wire connection.
1)
If the problem persists:
▶ Replace the gas valve and/or wire connections and/
or electronic control unit. For gas valve replacement
perform gas and air tuning ( section 10.11).
1)
EF Wrong gas connected (LP instead of NG) for
current appliance configuration.
▶ Check gas type ( section 3.3).
1)
F2 Electronic control unit internal error. ▶ Reset error (press and hold on/off button for 3
seconds).
If the problem persists:
▶ Replace electronic control unit.
1)
F3 Electronic control unit internal error. ▶ Reset error (press and hold on/off button for 3
seconds).
If the problem persists:
▶ Replace electronic control unit.
1)
F7 Electronic control unit internal error. ▶ Reset error (press and hold on/off button for 3
seconds).
If the problem persists:
▶ Replace electronic control unit.
1)
F8 Electronic control unit internal error. ▶ Reset error (press and hold on/off button for 3
seconds).
If the problem persists:
▶ Replace electronic control unit.
1)
F9 Gas valve driver internal fault. ▶ Check gas valve wire connections.
1)
If the problem persists:
▶ Replace the wire connections and/or electronic
control unit.
1)
FA Gas leakage in the gas path (gas valve or gas
manifold shut-off valves).
▶ Replace the gas valve and/or gas manifold.
1)
▶ After gas valve and/or gas manifold replacement
perform gas and air tuning ( section 10.11).
1)
Display shows
SOLAR but without
existence of solar
thermal system.
Power demand lower than appliance minimum
output power.
▶ Increase hot water flow.
▶ increase setpoint temperature.
Display shows
SOLAR and water
temperature low.
Display Description Solution
Table 20