Rinnai RHFE-750ETR - Manual (Page 12)

12 Rinnai Corporation RHFE-750ETR
WARNING
Do not clean glass when hot.
Do not clean glass with abrasive cleaners.
Care and Maintenance
Over time combustion products may leave a film on
the combustion chamber glass. Continued use of the
appliance may permanently stain the glass. If filming
occurs, this glass panel needs to be removed,
cleaned, and installed only by a qualified service
technician.