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American Water Heater (A)BCG385T500-8N User Manual

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Servicing should only be performed by a Qualifi ed Service Agent
TROUBLESHOOTING
TEST 6: BLOWER ON, NO IGNITION
Conditions:
Power on
• 
Plugs in receptacles
• 
Blower (Draft Inducer) operating
• 
No power to Hot Surface Igniter (HSI).  Note LED flash code.
• 
Blower
Exhaust
Blower 
Prover Switch 
Blower
(Draft Inducer)
Hot Water Outlet
Check E4 pin 2 to ground
 
Figure 25
TEST 6
24 VAC Check of Blower Prover Switch Circuit
IF.........
then............
ignition board receptacles E1, Pin 7 to ground 
shows no voltage
replace Ignition board.
E1, Pin 7 has 24 Volt to ground
check wire connection to and from blower (draft inducer).
voltage check of each blower switch terminal to 
ground shows voltage to only 1 terminal
•  switch is open.  Check for proper draft (should also see LED 3 flash code).
•  check for blocked exhaust. 
•  check that blower outlet exhaust damper is open.
•  replace blower prover switch.