Explanation: Unit was operated prior to vent
installation OR unit detected blockage in the venting
during pre-purge OR post-purge cycle.
90 – Error Code will occur BEFORE unit goes to
ignition.
99 – Error Code will occur AFTER unit shuts down.
Unit must be reset by performing reset procedure
on page 26.
Diagnostic Checks:
Perform reset procedure on page 26
VENTING – refer to pages 8-11 or refer to
Use & Care manual for installation
instructions:
1. Approved vent materials
2. Approved terminations
3. Approved vent lengths
4. Location and distance between venting
(recirculation of exhaust)
5. Blocked venting
6. Venting not sealed properly
(recirculation of exhaust)
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