Hearth & Home Technologies CERONA-42 User Manual

Heat & Glo  •  Cerona-36, Cerona-42  •  2106-900 Rev. H  •  11/08

7

Surface cracking or crazing of fi rebrick material is normal 

and expected.  The following types of cracks are acceptable 
and do not require replacement of the unit or the fi rebox:

•  Cracks that do not propagate entirely thru the material.

•  Light fracture lines or “spider-webbing” on the surface of 

the material.

•  Cracks that are less than 1/32 in. wide and less than 3 

in. long.

•  If cosmetically unacceptable, such cracks may be 

repaired with the SRV-PACK service kit.  See Service 
Parts List.

Cracks that are unacceptable:

•  Cracks greater than 1/32 in. wide and 3 in. long are at 

risk of growing.

•  Cracks that penetrate entirely through the firebrick 

material.

Inspection for cracking should be run when the appliance 
is cool.  Cracks tend to close as the appliance heats up.