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Bosch Greentherm T9900 SE 160 Installation And Operating Instructions Manual page 69

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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Description
CE
Flue blockage detected during operation due to
excessive pressure on the siphon.
CF
Flue blockage detected during operation due to
insufficient combustion air.
E0
Electronic control unit internal error.
E1
Hot water temperature above 194 °F (90 °C).
Appliance burner cut off to prevent scalding and
reactivation after cooling down.
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.
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.
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.
Greentherm T9900 SE/i – 6 720 813 635 (2019/03)
Solution
▶ 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).
▶ 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).
▶ Reset error (touch and hold on/off button for 3
seconds).
If the problem persists:
▶ Replace electronic control unit.
▶ Disconnect the appliance and purge hydraulic circuit
to remove air.
If the problem persists:
▶ Reduce setpoint temperature to minimize
temperature instabilities.
▶ Descale appliance ( section 7.3).
▶ 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
1)2)
specification.
▶ Check for flue gas leakage inside the cabinet or
1)
concentric vent.
▶ 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
1) 2)
specification.
▶ Descale appliance ( section 7.3).
▶ 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
1) 2)
specification.
Problem solving
1)
1)
1)
1)
1)
69

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