1. Check the gas type of the water heater.
2. Check how long the water heater has been installed and in use.
3. Check the installation place.
4. Check the altitude/elevation where the water heater is installed.
5. Check the vent length.
6. Check if there is any blockage in the intake air and/or exhaust.
7. Check if there is dust and lint in the burner and heat exchanger,
especially when the water heater is installed in a laundry room.
8. Check if there is grease and dirt in the burner and fan motor,
especially when the water heater is installed in a restaurant.
9. Check the manifold gas pressure in the water heater.
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Clearing the Code:
Locate the INC and DEC buttons located on the PCBD inside the unit. Press and Hold the INC and DEC buttons simultaneously for 5 sec then release. Locate the POWER SWITCH above the PCBD and turn power OFF and then back ON. Once boiler is powered on. Initiate a call for heat with your thermostat. If Boiler does come on and error code is still displayed. Check steps 1 thru 9 above again.
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