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Trouble
Possible Cause
Remedy
Hot water is not the
right temperature
(too hot or too cold)
Temperature set point was
reset due to power outage.
Temperature set point
incorrect.
Flow is beyond capacity
Incoming water is too warm
Power outage restores default settings and
custom set points must be re-entered to unit
A remote wired controller is controlling
temperature set point. Release override
control of this remote (see
“Remote Control
Panel Functions”
) or change set point to
desired temperature with that remote.
Desired water flow is above maximum
capacity of unit. Reduce user flows to re-
establish control of temperature
If incoming water to unit is very warm and
the flow is just above minimum
requirements, the heat generated by the
burner while operating at minimum capacity
can make the water hotter than desired.
Increase the hot water user flow so that the
burner system can control the temperature.
Hot water flow
produced is lower than
expected
Water source is restricted
Heat exchanger in unit is
scaled
Incoming water temperature
is colder than expected
Check and fully open water inlet valve(s)
Check and clean inlet water screen
Clean heat exchanger by flushing per
maintenance procedure.
Colder than normal incoming supply water
will reduce the amount of hot water than can
be produced. Although the amount of heat
output from the unit is still at full capacity,
you must reduce the user flow and operate
within the capacity range of the heater.
The hot water coming
appears white and
turbid.
Small bubbles may appear
when water is heated. Air
dissolved in water may
evolve when water is
heated.
None. Normal operation.
Summary of Contents for AHG-T42-LP
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