Blocked Air Intake - A.O. Smith BTH 120 Service Handbook

5. BLOCKED AIR INTAKE

Blocked Air Intake
Fault occurred 2 mins ago
Restriction in air intake. Check
intake pipe and termination for
blockage.
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CHECK/ REPAIR:
• Check pipe for restriction or excessive equivalent length.
• See Instruction Manual for pipe size, length and maximum number of elbows.
• Check actual pipe pressure with a manometer during blower operation. See "Pressure Switch Tests" section
on Page 12 thru Page 15 under "Blower Operation Error" on Page 11.
20
BACK ADVANCED
Servicing should only be performed by a Qualified Service Technician
CAUSES:
• The Blocked Air Intake Switch has detected a
possible restriction in the air intake pipe.