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TANKLESS WATER HEATER
Display
Nothing appears on
the display control
panel but the fan runs
at full speed
Nothing appears on the
display control panel
and no other water
heater components are
operating
Nothing appears on
the display control
panel, but the water
heater is operating
Display repeatedly goes
through
initialization
sequence
Table 28 – Diagnostics and Suggested Corrective Actions
DANGER
be performed by the user/owner to assure maximum efficiency and reliability. Follow the maintenance
procedures given throughout this manual. Failure to perform the service and maintenance or follow the
directions in this manual could damage the water heater or system components, resulting in substantial
property damage, severe personal injury, or death.
Check the Surrounding Area
DANGER
• Remove products immediately from area.
• If contaminants have been there for an extended period, call a qualified service technician to inspect the
water heater for possible damage from acid corrosion.
If products cannot be removed, immediately call a qualified service technician to re-pipe the combustion
air intake piping away from the contaminated areas.
66
Condition
Check wiring for short circuit or incorrect
Control is not
Check transformer connection to the
receiving power
control per wiring diagram. Check for
Ensure service switch and/or circuit breaker to
Is there 120V at the service switch
Control is not receiving
120V power
Is the ON/OFF switch inside the water heater
Check for 120V at the line voltage terminal
Occurs when commu-
nications is lost from the
Inspect the fuse. Replace as necessary
control to the display
Check for loose connections and proper pin
Occurs when control
control' s plug. Cycle power off and on using wa-
does not receive signal
ter heater power switch and check for operation
from fan
Cycle power off and on using appliance power
Maintenance Procedures
The water heater must be inspected and serviced annually, preferably at the
start of the heating season, by a qualified service technician. In addition, the
maintenance and care of the water heater as outlined in this manual must
To prevent the potential of substantial property damage, severe personal
injury, or death, eliminate all the materials, listed in Error! Reference source
not found, from the area surrounding the water heater and the vicinity of the
combustion air intake. If contaminates are found:
Diagnostic
wiring
14V output of panel wire
water heater is turned ON
cabinet turned on
block located inside the water
heater cabinet
alignment / engagement on the
switch and check for operation
PART 13
Possible Corrective Actions
Correct wiring per wiring diagram including
connection of transformer to the control
Push the Power button on the control panel
Turn on service switch or circuit breaker to
power water heater
Troubleshoot and correct the power supply
to the manual switch
Turn ON the manual power switch inside the
water heater cabinet
Correct wiring inside the water heater cabinet
using the wiring diagram in the installation
manual
Replace the fuse with the proper part found
in the replacement part section of this manual.
If fuse blows again, recheck the wiring per
diagram
Check for continuity on the wire harness
from the display to the control. See repair
parts section for proper replacement part.
Replace fan.
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