TROUBLESHOOTING GUIDELINES

WATER HEATER CONTROL

TROUBLE SHOOTING

Please check guidelines below. For your safety, water heater service should be performed only by a qualified service technician.

Read the GENERAL SAFETY INFORMATION section first.

INTELLI-VENT TROUBLESHOOTING CHART - USER CONTROL

#

LED STATUS

PROBLEM

SOLUTION

6

B C D E F

Ignition/flame failure.

1. Gas supply is turned off-pressure too low. Ensure supply and

 

The water heater has reached the

manifold gas pressures are within requirements in installation

 

 

manual. Manifold gas pressure is non-adjustable if pressure is

 

 

maximum number of retries and is

off by more than 0.3” W.C. (75 Pa) replace Intelli-Vent™ control.

 

 

currently locked out for one hour.

2. Low supply voltage - should be 115 -125 VAC.

 

 

 

 

 

Cycle the power to the water heater

3. Ensure flame sensor is making good contact with burner

 

 

off and on to reset.

flame, ensure flame is steady see #8 below.

 

 

Service Note:

4. Ensure the flame sensor is clean - use ultra fine steel

 

 

The resistance (ohms) of a hot surface

wool or Scotch-Brite™ pad to clean flame sensor.

 

 

ignitor will increase over time. If the

5. Ensure the hot surface ignitor is positioned to provide

 

 

resistance at room temperature is near

 

 

consistent ignition.

 

 

18.8 ohms - consider replacing the ignitor

 

 

6. Check for any cracks in ignitor assembly ceramic

 

 

as a preventative measure.

 

 

 

insulators - replace ignitor assembly if damaged.

 

 

 

7. Check resistance of ignitor at room temperature (77ºF)

 

 

 

(25°C) at the plug end. Replace ignitor if resistance is

 

 

 

not within 11.5 and 18.8 ohms at room temperature.

 

 

 

8. Ensure correct size of vent pipe (2”, 3”, 4”) was used per

 

 

 

installation manual for vent length. Using larger pipe than required

 

 

 

may cause excessive air turbulance in combustion chamber.

 

 

 

 

7

B C D E F

Self diagnostic tests have found a problem

1. Turn the power off for 10-20 seconds then on again to

 

with the gas valve driver circuit, internal

clear these error codes.

 

 

microprocessor, or other internal circuits.

2. If any of these error codes persist or cannot be cleared-

8

B C D E F

 

replace the Intelli-Vent™ control.

 

 

 

9

B C D E F

 

 

 

 

 

 

 

 

 

10

B C D E F

Flame signal has been sensed out of

1. Turn the power off for 10-20 seconds and then on again

 

proper sequence.

to clear this error code.

 

 

 

2. Replace the Intelli-Vent™ control if this error code persists.

 

 

 

 

 

B C D E F

Water temperature in the tank has

1. Turn the power off for 10-20 seconds then on again

11

exceeded 195°F (91°C) and has

to clear this error code.

 

 

 

activated the ECO.

2. Replace the Intelli-Vent™ if the error code persists.

 

 

 

 

 

 

 

 

 

The self diagnostic check detected one

1. Press and release temperature adjust buttons. If above

12

B C D E F

or both of the temperature adjust buttons

action does not clear error, control will continue to regulate

 

 

are stuck.

water temperature at last setting. However, settings will no

 

 

 

longer be adjustable - the control should be replaced.

 

 

 

 

 

B C D E F

The self diagnostic test has detected the

1. Turn power off for 10-20 seconds then on again to

13

 

water temperature sensor (thermistor) is

clear this error code.

 

 

either open or shorted.

2. Replace the Intelli-Vent™ control if this error code persist.

 

 

 

14

B C D E F

Self-diagnostic test found a problem with black

1. Turn off power to the water heater.

 

resistor wire on the ignitor assembly plug; resistor

2. Insure black resistor wire is not cut, missing, and is installed

 

 

wire is open or shorted.

between pins 3 & 4 of ignitor assembly plug. Replace ignitor

 

 

Service Note: To perform this test ohm meter

assembly if damaged or defective.

 

 

3. Unplug ignitor assembly plug from control. Check resistance

 

 

used must be capable of reading up to 2,000,000

of black resistor wire between pins 3 & 4 with an ohm meter.

 

 

ohms. Unless ohm meter used has an auto-range

3.1 If reading taken is less than 2000 (5000 for date code 0617

 

 

feature resistance should be checked twice. First

through 0709) or more than 1.7 million ohms, replace ignitor

 

 

reading will be taken using an ohms scale above

assembly. 3.2 If reading taken is between 2000 (5000 for date

 

 

1,700,000 ohms. Second reading is taken using

code 0617 through 0709) and 1.7 million ohms, replace

 

 

ohms scale just above 2,000 or 5,000 ohms.

Intelli- Vent™ control.

 

 

 

Service Note: Raised ridges on ignitor assembly plug identify

 

 

 

#1, #2, and #3 pins. The four-digit date code can be found on

 

 

 

side of the controller.

 

 

 

 

19

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American Water Heater Commercial Ultra Low NOx Gas water Heater, BBCN375T754NV warranty D E F
Page 18 Page 20

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