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2.5 DIAGNOSTIC CODES
Whenever a failure occurs, an alert sounds and a diagnostic code is displayed to indicate the
failure mode at the time of occurrence.
Figure 1 - Control Panel
Example- Displaying Error
Code E2
The hot water coming
appears white and
turbid.
when water is heated. Air
dissolved in water may
evolve when water is
Vent system trouble
Vent system is restricted in
some manner.
Check air intake and exhaust ducts to ensure they are
not damaged, corroded, blocked,
“Smoke” observed
coming from exhaust
system during cold
temperatures
during combuson is
condensed in the exhaust as
the hot gas is cooled by the
Water leaking from
safety valve outlet
above design pressure.
Consult professional for system review.
Replace safety valve. Consult professional as
be heard for some me
The blower is designed to
run for 30 seconds aer
The volume alarm does
not sound even though
the volume appears to
be adequate
Units incorrect during input
Measuring ow of only hot
water instead of hot water
and cold water combined
Refer to “H2O SAVER TECHNOLOGY™ - Set a
Desired Volume” secon to ensure units
(metric vs. English) and volume (displayed
volume number represents 1/10th of the actual total
ow) are correctly set.
The volume measurement only keeps track of
the water volume that passes through the
water heater. If hot water going to a tub is
combined with cold water, the volume
computed would not be representave of the
total amount that may have been dispensed.
Unresolved problem Other assistance required
Consult Marey or contact an authorized service
professional.
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