Bosch Greentherm T9900 SE 160, Installation And Operating Instructions Manual

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Problem solving
69 Greentherm T9900 SE/i – 6 720 813 635 (2019/03)
CE Flue blockage detected during operation due to
excessive pressure on the siphon. ▶ Reset error (touch and hold on/off button for 3
seconds).
If the problem persists:
▶ Check exhaust pipes and terminals for obstructions
and reset the error.
▶ Check if flue length is according to specification
(

section 4.6) and reset the error.
▶ Perform gas and air tuning (

section 8.12).
1)
CF Flue blockage detected during operation due to
insufficient combustion air. ▶ Reset error (touch and hold on/off button for 3
seconds).
If the problem persists:
▶ Check air intake and exhaust pipes and terminals for
obstructions and reset the error.
▶ Check if flue length is according to specification
(

section 4.6) and reset the error.
▶ Perform gas and air tuning (

section 8.12).
1)
E0 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)
E1 Hot water temperature above 194 °F (90 °C).
Appliance burner cut off to prevent scalding and
reactivation after cooling down. ▶ Disconnect the appliance and purge hydraulic circuit
to remove air.
If the problem persists:
▶ Reduce setpoint temperature to minimize
temperature instabilities.
E3 Flue gases temperature above 167 °F (75 °C)
(residential) or 2 minutes above 145 °F (63 °C).
Appliance burner cut off to prevent overheating. ▶ Descale appliance (

section 7.3).
1)
▶ Reset error (touch and hold on/off button for 3
seconds).
If the problem persists:
▶ Check sensor resistance [15] (

section 11) and
replace the sensor if it is not according to
specification.
1)2)
E4 Air temperature inside cabinet above 176 °F
(80 °C) or 2 minutes above 158 °F (70 °C).
Appliance burner cut off to prevent overheating. ▶ Check for flue gas leakage inside the cabinet or
concentric vent.
1)
▶ Reset error (touch and hold on/off button for 3
seconds).
If the problem persists:
▶ Check sensor resistance [18] (

section 11) and
replace the sensor if it is not according to
specification.
1) 2)
E5 Condensing unit flue gases temperature above
428 °F (220 °C) or 2 minutes above 392 °F
(200 °C).
Appliance burner cut off to prevent overheating. ▶ Descale appliance (

section 7.3).
1)
▶ Reset error (touch and hold on/off button for 3
seconds).
If the problem persists:
▶ Check sensor resistance [16] (

section 11) and
replace the sensor if it is not according to
specification.
1) 2)
Display Description Solution