Bosch Greentherm 9800 SEO 160 Installation And Operating Instructions Manual page 41

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