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On-Demand
Water
Heater
H C
A
"A" Open
B
"C" Closed
C
D
"B" Closed
"D" Open
Outlet Hose
(Hot)
NOTE: Close
valve on
return line.
Bucket
Figure 2: Water flow test.
Next Step:
Finally, check to see if the unit has an error
code. The error code will be displayed on
the temperature controller (or remote
controller) and by flash codes on the green
LED on the computer board. See Figure 3,
page 11. See also the error code chart in
Table 2 starting on page 11.
•
If it is displaying an error code, proceed
to "ERROR CODES" on page 11.
•
If there is no error code, proceed
to "General Issues."
General Issues
Proceed to the "Error Codes" section
if an error code is identified. For other
common problems that do not involve
error codes, see if the following items
help:
Water is too hot or not hot
enough.
•
What is the set temperature
of the water heater? The
temperature setting may be set
8
•
On-Demand Water Heater Service Handbook for X3P Models
too high or low. The temperature
can be adjusted using the
temperature or remote controller.
Solar installation can have higher
inlet water temperatures. NOTE:
To reduce the risk of scalding,
install Thermostatic Mixing Valves
(temperature limiting valves) at
each point-of-use.
•
If a mixing valve is installed, verify
proper installation and check
temperature setting at the valve.
The mixing valve may need to
be adjusted or cleaned. Refer to
the mixing valve manufacturer's
instructions.
•
The output thermistor could be
malfunctioning or debris may be
present on the thermistor. This
could cause it to read incorrectly.
Clean the thermistor and recheck.
•
Cross plumbing between cold
water lines and hot water lines.
•
Incorrect gas supply line and/or
regulator sizing.
•
Easy-Link misconfiguration in multi
unit system.
Temperature fl uctuates when a
fi xture is opened.
•
Check DIP switches for correct
setting. Incorrect settings for
altitude and vent length can result
in fluctuating outlet temperature.
•
Test whether the problem is
within the unit or external to the
unit (i.e., plumbing system).
•
If the unit is installed in a multi-
unit system, verify that the Easy-
Link system is set up correctly.
Refer to the installation manual.
•
The filter on the cold water inlet
should be clean. See"Filter/Drain Plugs
Cleaning" on page 29.
•
Fluctuations in pressure of the
supply water system will result in
outlet temperature fluctuations.
On well systems, the heater's
operation will fluctuate when the
well pump is charging the bladder
tank. Check the pressure settings
to see if an adjustment can reduce
the pressure difference and/
or consider a constant pressure
pump.
Unit does not operate when
water goes through it.
•
Check to see if the water heater is
in standby. This can be verified by
observing the amber LED on the
temperature/remote controller.
If is not lit, press the ON/OFF
button on the controller to see if
it will turn on. If not, then check
to see if the ON/OFF button to the
right of the temperature controller
is set to the on position, or if the
fuse in the fuse box assembly is
blown.
•
Is the flow rate over 0.4 GPM?
See if the unit initiates when you
increase demand of water being
drawn through the unit (e.g.,
opening up more hot fixtures).
You can verify the flow rate by
pressing the info button on the
front of the unit until the arrow
lights up beside "flow." See"Filter/
Drain Plugs Cleaning" on page
29.
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