John Wood Envirosense Power Direct Vent (May 2010 or later) - Manuel (Page 54)

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Only qualified service technician, as defined in Qualifications using
appropriate test equipment, should perform any service procedures
on the water heater.
NOTE: If you are not qualified and licensed or certified as required
by the authority having jurisdiction to perform a given task do not
attempt to perform any of the diagnostic or service procedures
described in the following section.
If you do not understand the instructions in the following section do
not attempt to perform any procedures.
Call the technical support phone number listed on the back cover of
this manual for further technical assistance or to locate a qualified
service technician in your area.
FAULT AND ALERT CONDITIONS
FAULT CONDITIONS
When the control system declares a Fault condition it will display a
Fault message on the control system's LCD with an exclamation "!"
mark. The control system will lock out and disable heating operation
until the condition is corrected. The water heater must be serviced
by a qualified service technician before operation can be restored.
ALERT CONDITIONS
When the control system declares an Alert condition it will display
an Alert message on the control system's LCD with a question "?"
mark. The water heater will continue to operate during an Alert
condition but the water heater must be serviced by a qualified
service technician as soon as possible.
RESETTING CONTROL SYSTEM LOCK OUTS
To reset the control system from a lock out condition; turn off the
switch in front of the unit for approximately 20 seconds and then
back on. Keep in mind: if the condition that caused the Fault has
not been corrected, the control system will continue to lock out.
DIAGNOSTIC CHECKS
Turn off power to the water heater
before performing any service.
Electrical Shock Hazard
•
Label all wires prior to disconnecting
when performing service. Wiring errors
can cause improper and dangerous
operation.
•
Verify proper operation after servicing. •
Failure to follow these instructions can
result in personal injury or death.
•
The following section, Fault And Alert Messages lists some of the
messages the control system will display on the LCD when there
are operational problems. This is not a complete list. Along with
each of the Fault and Alert messages described there will be a list
of possible causes and things to check and repair.