Rinnai HE Series How To Use Manual page 159

10. Remove burner manifold and inspect for insects or other debris in air channel for restriction.
11. Remove burner and inspect copper fins in heat exchanger for a build up between fins. This will cause
air flow restrictions which can lead to code 10's. If build up is present, you will need an air compressor
capable of delivering 120 psi of air to blow out the burner and heat exchanger fins. If unable to clean the
heat exchanger with compressed air replace the heat exchanger. Always wear safety glasses and a mask
when blowing out the burner.
12. Verify low and high fire manifold pressures are set correctly. Some model units have a burner sensor
if the manifold pressures are not properly set the temperature range for this senor may be too low
causing a code 10. This information can be found under the front cover in the plastic holder. If missing
contact Rinnai for proper gas pressure setting procedures.
13. Verify manifold gas pressures and dip switches were properly set for your altitude. This information
can be found under the front cover in the plastic holder. If missing contact Rinnai for proper gas
pressure setting procedures.
14.. Other items that could cause code 10's;
a. Bad fan motor bearing
b. Bad wiring harness to fan motor from PC board
c. Bad PC board
d. Improper dip switch settings
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