Bosch Greentherm T9800 SEC 199 Installation And Operating Instructions Manual page 64

64 | Problem solving
Display Description
FC Touch screen key pressed for more than 20
seconds.
Display reads Power demand lower than appliance minimum
SOLAR but without output power.
existence of solar
thermal system.
Display reads
SOLAR and water
temperature low.
Display shows a HMI (display) is not communicating with Electronic
red X. Control Unit.
High pitch noise Combustion flame with gas in excess or lack of air. ▶ Check if gas type is correct ( section 6.8).
(whistling)
Low pitch noise Combustion flame with air in excess or lack of gas. ▶ Check if gas type is correct ( section 6.8).
with vibration
(rumbling)
Table 27
1) only to be carried out by qualified contractors.
2) see temperature resistance charts in fig. 62 and 63.
Note: If the appliance is locked for safety reasons, information is shown on the display to give more information on the problem.
Once the problem is solved, you may have to reset the error (touch and hold
effect if error is visible on the display.
6 720 816 815 (2018/08)
Solution
▶ Release the touch screen key.
▶ Clean the touch screen display.
▶ Increase hot water flow.
▶ increase setpoint temperature.
▶ Reset the appliance by unplugging it for some
seconds (at least 10) and plug it back in.
▶ Replace the HMI (display) and/or wire connections
and/or electronic control unit.
▶ Check gas inlet pressure ( section 4.13).
▶ Perform gas and air tuning ( section 8.11).
▶ Check gas inlet pressure ( section 4.13).
▶ Perform gas and air tuning ( section 8.11).
button for 3 seconds). Error reset will only take
Greentherm T9800 SE 160/199 | SEC 199
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