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AP18733 REV. 3.2.17
77
Check for 120V at the line voltage terminal block
located inside the water heater cabinet
Correct wiring inside the water heater cabinet using
the wiring diagram in the installation manual
Inspect the fuse. Replace as necessary
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
Nothing appears on
the display control
panel, but the water
heater is operating
Occurs when
communications
is lost from the
control to the
display
Check for loose connections and proper pin
alignment / engagement on the control’s plug
Check for continuity on the wire harness from the
display to the control. See repair parts section for
proper replacement part.
Cycle power off and on using water heater
power switch and check for operation
Replace with new display module. See repair parts
section for proper replacement part.
Display repeatedly
goes through
initialization sequence
Occurs when
control does not
receive signal
from fan
Cycle power off and on using appliance power
switch and check for operation
Replace fan.
Table 31 –Diagnostics and Suggested Corrective Actions
MAINTENANCE PROCEDURES
DANGER
DANGER
The water heater must be inspected and serviced annually, preferably at the start of the heating season, by a qualied service technician. In
addition, the maintenance and care of the water heater as outlined in this manual must be performed by the user/owner to assure maximum
efciency 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.
To prevent the potential of substantial property damage, severe personal injury, or death, eliminate all the materials listed in Table 1 from the area
surrounding the water heater and the vicinity of the combustion air intake. If contaminates are found:
● Remove products immediately from area.
● If contaminates have been there for an extended period, call a qualied 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.
Combustible/Flammable Materials
Do not store combustible materials, gasoline, or other ammable vapors or liquids near the water heater. If found, remove these materials
immediately.
Air Contaminates
If allowed to contaminate combustion air, products containing chlorine or uorine will produce acidic condensate that will cause signicant
damage to the water heater. Read the list of potential contaminates and areas likely to have these contaminates in Table 1. If any of these
contaminates are in the room where the water heater is located, or combustion air is taken from one of the areas listed, the contaminates must
be removed immediately or the intake pipe must be relocated to another area.
Ensure the Water Heater Cabinet is Closed
Ensure the water heater cabinet is closed. Tighten the two upper and lower screws to secure it. The cabinet must be closed while the water
heater is running.
Check the Power Source
Make sure the power cord is properly connected. The main power line is connected to the manual switch box inside the water heater.
Check the Status of the Control Panel
Observe the Control Panel to ensure the water heater is powered on, and to check for any error codes. Clear any debris from the panel.
Check Exhaust Vent and Intake Pipe Terminations
Verify that the water heater exhaust vent and intake pipe terminations are clean and free of obstructions. Remove any debris from the exhaust
vent or intake pipe openings. If removing the debris does not allow the water heater to operate correctly, contact your qualified service
technician to inspect the water heater and the vent system.
Check Exhaust Vent and Intake Piping
Visually inspect the exhaust vent for any signs of blockage, leakage, or deterioration of the piping. Inspect the exhaust vent bracing. Ensure
bracing is undamaged and in good condition. Notify a qualied service technician immediately if any problems are found.
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