ICP
33
ProtectLimit or rollout open
The winter callback. Airflow first; rollout is hazard.
Walk 33 in Diagnose
3 plates — walk the one on the cabinet
First check
1 Treat this as flame outside the exchanger
Do not reset the ICP N80ESN rollout and walk away. Write the code, kill the call, and look for flame at the burners, crossover, and vestibule before you do anything else.
Expect: No flame outside the exchanger. Burners seated. Crossover lit.
If pass: Still inspect secondary / flue / condensate before you reset.
The rest of the walkthrough is Diagnose.
On the plates
- Filter, heat-speed tap (this is not a VS 59TP6 menu), coil, return, TES.
- Rise vs plate. Overfire on a single-stage orifice.
- Rollout manual reset — inspect exchanger / burners / flue before you reset.
- Three minutes → 13.
Plates that use 33
Same number, other makers
33 on ICP is not the same code on these plates.