Blocked Air Intake - State Water Heaters 120 Series Service Handbook

fault messages
displayed message/condition/indicates

blocked air intake

The Control System has detected the Blocked Intake Air
switch has open contacts - restricted combustion air intake
to the water heater, inadequate supply of combustion air.
Blocked Air Intake
Fault occurred 2 mins ago
The combustion air intake is
restricted.
Call a service professional:
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Important Service Reminder:
When performing any troubleshooting steps outlined in
this manual always consider the wiring and connectors
between components. Perform a close visual inspection
of all wiring and connectors to a given component before
replacement.
BACK ADVANCED
Servicing should only be performed by a Qualified Service Agent
possible causes - checK/repair
• If the water heater has been installed as a
conventional vent appliance - Ensure screen inside
the intake air connection fitting is not clogged with
debris. Clear any debris from the screen. See Intake
Air Connection on page 5.
• If water heater has been installed in a direct Vent
configuration - check for restrictions, intake air
pipe size too small, too many equivalent feet, or
too many installed elbows in the intake air piping.
Review venting installation section of the Instruction
Manual that came with the water heater - see Table
1 on page 4 in this manual. Ensure the vent/intake
air piping has been installed within manufacturers
requirements.
• If water heater has been installed in a direct Vent
configuration - ensure there is not a low point in the
intake air piping that will allow water/condensate to
collect and block the intake air piping.
• If water heater has been installed in a direct Vent
configuration - temporarily disconnect the intake
air pipe to the water heater - ensure the screen
inside the intake air connection was removed during
installation. See Intake Air Connection on page 5.
• Check all wiring between the Blocked Intake Air
switch and the CCB's J6 Socket (page 41) pins 4 &
14. Perform close visual inspection of the pins inside
the plug and socket - ensure plugs and sockets are
mating properly and providing good contact. Repair/
replace anything worn or damaged.
• If water heater has been installed in a direct Vent
configuration - ensure the screen inside the intake air
pipe termination fitting is not blocked or restricted.
• Perform the Pressure Switch Tests on page 31.
Replace the Blocked Intake Air switch if it is defective.
• Call the toll free support phone number on the back
cover of this manual for further assistance if the
problem has not been corrected after performing the
procedures outlined here.
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