22
TROUBLESHOOTING GUIDE
Disconnect the electrical power before servicing the water heater. Service should only be performed by a
qualified service technician. Failure to follow these instructions can result in personal injury and/or death.
WARNING
DANGER
Note for models with a manual reset only:
Since the high limit switch on the blower is in series with the pressure switch, the problem could be that
the high limit switch tripped. Reset the high limit Switch by pressing on the red button in the middle of the switch.
1
An open earth ground circuit to the igni-
tion.
1) Check that the earth ground conductor is properly connected at the fuse box or breaker panel and the
water heater.
2) Check that the grounding conductors on the water heater are properly connected and secure.
2
A wiring error or a high resistance to
earth ground.
1) Check for proper connection of the line neutral and line hot wires.
2) Check that the water heater is securely connected to earth ground.
3
The pressure switch remained closed
longer than five (5) seconds after the call
for heat began.
1) The pressure switch wiring is incorrect.
2) The pressure switch is defective and must be replaced.
4
The pressure switch remained open
longer than five (5) seconds after the
power venter was energized.
(see note at the bottom of the page)
1) The pressure switch wiring is incorrect.
2) The pressure switch tubing is not properly connected.
3) There are obstructions or restrictions in the water heater air intake or exhaust flue.
5
The self-diagnosing test has detected an
error in the hot surface ignitor circuit.
1) Check the wiring is correct and secure.
2) Disconnect the ignitor connector and measure the ignitor resistance with an accurate
ohmmeter between pins 1 and 2. Resistance should be between 11.5 and 18.8 ohms.
If the reading is incorrect, replace the hot surface ignitor.
3) If the above checks are good, replace the gas control valve.
6
The maximum number of ignition retries
or recycles has been reached and the
system is in lock-out mode.
1) Check if the gas supply is off or too low to operate.
2) Check the flame sensor rod to see if it is located properly and free from contamination. Reposition the
flame sensor rod or lightly clean it with an abrasive cloth.
3) The hot surface ignitor may not be positioned correctly. Reposition as necessary.
4) Check that the hot surface ignitor and flame sensor rod are wired correctly and in good working
condition.
5) Low voltage to the water heater. Check and repair.
7
The gas valve driver circuit.
1) Turn off the power to the water heater for ten (10) seconds and then back on.
2) If the above step did not clear the error, replace the gas control valve.
8
The internal microcomputer.
1) Turn off the power to the water heater for ten (10) seconds and then back on.
2) If the above step did not clear the error, replace the gas control valve.
9
The internal circuit.
1) Turn off the power to the water heater for ten (10) seconds, check polarity and then back on.
2) If the above step did not clear the error, replace the gas control valve.
10
Flame signal sensed out of proper
sequence.
Replace the gas control valve.
11
The high temperature thermal cut-off is
open.
Replace the gas control valve.
12
One of the temperature adjust buttons is
stuck closed.
1) Make sure that there are no objects leaning against the front of the control.
2) Lightly press and release each of the buttons once.
3) If the above actions do not clear the error, the control will continue to regulate the water
temperature at the last setting, but you will not be able to change settings unless you replace the gas
control valve.
13
The water temperature sensor is either
open or short-circuited.
1) Check that all of the wiring is correct and that there are no open or short circuits.
2) If no wiring problems are found, the gas control valve must be replaced.
14
The self-diagnosing test found a problem
with the flammable vapour sensor.
1) Check that all wiring is correct and that there are no open or short circuits.
2) If no wiring problems are found, the flammable vapour sensor must be replaced.
15
The control detected the presence of
flammable vapours near the appliance
and entered lock-out mode.
1) Identify the source of the flammable vapours and remove it from the area surrounding the water heater.
2) Contact a service technician to have the water heater inspected immediately.
16
Weak Flame Current.
1) Check that the flame sensor rod to see if it is properly located and free from contamination. Reposition
the flame sensor rod or lightly clean with an abrasive cloth.
2) Low voltage to the water heater. Check and repair.
CONDITION (code#)
CAUSE
REMEDY
