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Bosch Greentherm T9900 SE 160 Installation And Operating Instructions Manual page 70

Indoor residential tankless water heaters, 160 000/199 000 btu- natural gas 160 000/199 000 btu - liquefied petroleum lp gas
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Problem solving
Display
Description
E7
Electronic control unit internal error.
E8
Error during ionization test. Electronic control unit
internal error.
E9
Thermal fuse [13] broken.
EA
Ignition failure.
EB
Electronic control unit internal error.
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.
70
Solution
▶ Reset error (touch and hold on/off button for 3
seconds).
If the problem persists:
▶ Replace electronic control unit.
▶ Replace electronic control unit.
1)
▶ Replace thermal fuse.
▶ Check gas inlet pressure ( section 4.13).
▶ Perform gas and air tuning ( section 8.12).
▶ Reset error (touch and hold on/off button for 3
seconds).
If the problem persists:
▶ Replace electronic control unit.
▶ Check gas inlet pressure ( section 4.13).
▶ Perform gas and air tuning ( section 8.12).
▶ 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 8.12).
▶ Check gas type ( section 6.8).
▶ Reset error (touch and hold on/off button for 3
seconds).
If the problem persists:
▶ Replace electronic control unit.
▶ 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
1)
section 8.12.
If the problem persists:
▶ Replace electronic control unit.
▶ Reset error (touch and hold on/off button for 3
seconds).
If the problem persists:
▶ Replace electronic control unit.
▶ Reset error (touch 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.
Greentherm T9900 SE/i – 6 720 813 635 (2019/03)
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Greentherm t9900 se 199Greentherm t9900 se/i 199