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Bosch Greentherm 9800 SE 160/199 Manual page 56

Indoor residential and comme rcial tankless water heaters
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56 | Problem solving
Display
Description
EF
Wrong gas type.
F2
ECU internal error.
F3
Memory failure
F7
A flame is detected before gas valve open.
F9
Safety gas solenoid valve disconnected.
FA
Fault in the main gas shut-off valve or gas manifold
shut-off valve.
FC
Buttons touched for more than 30s.
Display reads SOLAR
The hot water temperature selected is lower than
but without
the minimum power that the appliance supplies.
existence of solar
thermal system.
Display reads SOLAR
and water
temperature low.
High pitch noise
Combustion flame with gas in excess or lack of air
(combustion adjustment is rich).
Low pitch noise with
Combustion flame with air in excess or lack of gas
vibration
(combustion adjustment is lean).
Table 26
1) only to be carried out by qualified contractors.
2) see temperature resistance charts in fig. 52 and 53.
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 touch the ON/OFF button for 3 sec. to restart the appliance.
6 720 816 815 (2016/10)
Solution
▶ Natural gas appliance supplied with liquid gas.
▶ Liquid gas appliance supplied with NG.
▶ To unlock, reset the appliance by touching the
ON/OFF button for 3 sec.
▶ If the problem persist replace ECU.
▶ To unlock, reset the appliance by touching the
ON/OFF button for 3 sec.
▶ If the problem persist replace ECU.
▶ Check the electrodes and the cable.
▶ To unlock, reset the appliance by touching the
ON/OFF button for 3 sec.
▶ If the problem persist replace ECU.
1)
▶ Check connections.
▶ To unlock, reset the appliance by touching the
ON/OFF button for 3 sec.
▶ Main gas shut-off valve or gas manifold shut-off
valve mechanical stuck/locked.
▶ Check main gas shut-off valve and gas manifold
shut-off valve electric circuit.
▶ Release the button.
▶ Minimum power is 9,000 BTU.
▶ Increase the hot water flow.
▶ increase the setpoint temperature.
▶ Check gas supply is according appliance gas type
(NG or LP).
▶ Check appliance CO
adjustment (excessive CO
2
see table 24).
Increase A1 or A2 air adjustment parameter.
▶ Check gas supply is according appliance gas type
(NG or LP).
▶ Check gas pressure supply (gas pressure too
low).
▶ Check appliance CO
adjustment (low CO
2
table 24).
Decrease A1 or A2 air adjustment parameter.
Greentherm 9800 SE 160/199 | SEC 199
1)
1)
1)
1)
,
2
1)
, see
2
1)

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