Bosch Greentherm T9900 SE/i 199 - Page 70

Problem solving
Greentherm T9900 SE/i – 6 720 813 635 (2019/03)
70
E7 Electronic control unit internal error. ▶ Reset error (touch and hold on/off button for 3
seconds).
If the problem persists:
▶ Replace electronic control unit.
1)
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 4.13).
1)
▶ Perform gas and air tuning ( section 8.12).
1)
EB Electronic control unit internal error. ▶ Reset error (touch and hold on/off button for 3
seconds).
If the problem persists:
▶ Replace electronic control unit.
1)
EC Flame lost during operation. ▶ Check gas inlet pressure ( section 4.13).
1)
▶ Perform gas and air tuning ( section 8.12).
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 8.12).
1)
EF Wrong gas connected (LP instead of NG) for
current appliance configuration.
▶ Check gas type ( section 6.8).
1)
F2 Electronic control unit internal error. ▶ Reset error (touch 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 (touch and hold on/off button for 3
seconds).
If appliance’s configuration is required:
▶ See section 6.6 to configure appliance (region,
power, type and gas type) and perform an automatic
combustion adjustment according to the
section 8.12.
1)
If the problem persists:
▶ Replace electronic control unit.
1)
F7 Electronic control unit internal error. ▶ Reset error (touch 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 (touch 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)
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