28
Operating Instructions
Flashing
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Check for an Error Code
If there is a problem with the unit, a numerical error code will flash on
the remote controller.
If this occurs, take appropriate measures as listed below.
When an error code appears, the display and the operation light
will flash together.
Main Controller
Have a professional check the gas supply pressure.
Contact Bosch 1300-30-70-37.
Abnormal combustion,
low gas supply pressure
Error Code
Cause
Action
Ignition error
Check whether the gas valve is open. Press the operation button to
turn the unit off, open a hot water fixture, and turn the unit back on.
If the flashing number doesn't return the problem is solved.
Contact Bosch if:
• Any other error code appears.
• An error code is indicated again after the above actions were followed.
• There are any other questions.
The hot water is turbid.
• This is harmless. Small bubbles appear as the air in the water
is heated and depressurized rapidly to atmospheric pressure.
The water appears blue
The bath tub/wash-basin has turned
blue.
• Coloration to a blue colour may be noticed from small traces of
copper ion contained in the water and fat (furring). However,
there are not problems concerning health. Coloration of the
bath tub/wash-basin can be prevented by cleaning frequently.
(Continued)
Contact the installer or Bosch Service Department for
assistance.
Abnormal combustion
Summary of Contents for YS1780RA
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