American Water Heater 160X3P Manual page 15

ERROR CODE GREEN LED ON
COMPUTER BOARD
991 Five Flashes
SYMPTOM OR ISSUE
Combustion Air and/or • Verify the gas type supplied to the water heater
Exhaust Gas Blockage
• Inspect the environment around the water heater.
• Check the altitude/elevation of the area where the
• Verify the vent length DIP switches match the
• Inspect your exhaust air intake for any blockages,
• If the water heater is installed as a direct-vent system,
• Check for dust and dirt on the air screen of the rain
• Check for connection/breakage of wires and/or burn
On-Demand Water Heater Service Handbook for X3P Models
TROUBLESHOOTING PROCEDURE
matches gas type orifice plate installed. DO NOT
operate the water heater if they do not match;
correct immediately.
water heater is installed, and verify the DIP switches
are set to the proper elevation.
equivalent vent length of the installed venting
system. Refer to See Table 5 on page 27.
clear if any are found.
check whether there is proper clearance between the
intake air terminal and the exhaust terminal. Refer to
pp. 26 to 28 of the Installation Instructions and Use &
Care Guide.
protection tray (Part #007) and verify air intake is not
blocked.
marks on the computer board (Part #701)
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