John Wood Envirosense Power Vent - Manual (Page 33)

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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 - RESIDENTIAL CONTROL
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Ignition/flame failure. 1. Gas supply is turned off - pressure too low. Ensure
6 supply and manifold gas pressures are within
The water heater has reached the requirements in the installation manual. Manifold gas
maximum number of retries and is pressure is non-adjustable if pressure is off by more
currently locked out for one hour. than 0.3” W.C. (75 Pa) replace the Intelli-Vent™ control.
Cycle the power to the water heater 2. Low supply voltage - should be 115 -125 VAC.
off and on to reset.
3. Ensure flame sensor is making good contact with the
service note: burner flame, ensure flame is steady see #8 below.
The resistance (ohms) of a hot surface
ignitor will increase over time. If the 4. Ensure the flame sensor is clean - use ultra fine steel
resistance at room temperature is near wool or Scotch-Brite™ pad to clean flame sensor.
18.8 ohms - consider replacing the ignitor
as a preventative measure. 5. Ensure the hot surface ignitor is positioned to provide
consistent ignition.
6. Check for any cracks in ignitor assembly ceramic
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 the 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 the combustion chamber.
Self diagnostic tests have found a problem 1. Turn the power off for 10-20 seconds then on again to
7 with gas control valve\thermostat driver clear these error codes.
circuit, internal microprocessor, or other
internal circuits. 2. If any of these error codes persist or cannot be cleared-
replace the Intelli-Vent™ control.
8
9
Flame signal has been sensed out of 1. Turn the power off for 10-20 seconds and then on again
10 proper sequence. again to clear this error code.
2. Replace the Intelli-Vent™ control if this error code persists.
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 the
12 or both of the temperature adjust buttons above action does not clear the error, the control will
are stuck. continue to regulate water temperature at the last setting.
However, settings will no longer be adjustable - the
control should be replaced.
The self diagnostic check has detected the 1. Turn the power off for 10-20 seconds then on again
13 water temperature sensor (thermistor) is to clear this error code.
either open or shorted.
2. Replace the Intelli-Vent™ control if this error code persist.
a B c
a B c
a B c
# led status
w
ater
hea
ter
control
a B c
a B c
a B c
a B c
a B c