| CONTROL DISPLAY STATUS | PROBLEM |
6. |
| The air pressure switch contacts |
|
| remain open longer than 11 |
|
| seconds after the combustion fan |
|
| is energized. |
| The air pressure switch contacts |
| remain closed for more than 5 |
| seconds when they should be |
| open. |
"IGN" Flashing | Open ignitor | circuit |
flammable vapors and is in lockout
SOLUTION
1. Clean the screen on the combustion air
intake chamber. Turn the power "OFF" for 10 to 20 seconds then "ON" again to clear the error code. If the problem persists:
2, Ensure the pressure switch sensing tube is in good condition and securely connected at both ends.
3.Ensure the inner door to the combustion
chamber is secure and the gasket is properly sealing.
4.Check operation of the air intake chamber fan and pressure switch.
A.Turn off power to the water heater.
B.Remove the tubing from the pressure switch and the wires from both terminals of the pressure switch.
C.Connect a diqital manometer to the open end of the tubing from the air
intake chamber. Turn on the power to the water heater and when the fan turns
on, measure the pressure reading in the tubing. If the pressure reading reaches the .22" WC make point of the pressure switch, turn off power to the water heater and reconnect tubing to the pressure switch. If pressure reading does not reach the .22" WC make point, check
the system and tubing for restrictions and cleanliness.
D.Attach leads of ohmmeter or continuity
tester to the terminals of the pressure switch. Turn on power to the water heater and when the air intake fan comes on, check for continuity across
the pressure switch contacts. If switch contacts remain open (no continuity) while the fan is in operation - replace the pressure switch.
1.Turn off power to the water heater.
2.Locate the pressure switch wiring - ensure pressure switch wiring is correct and not jumped.
3.Remove wires to both terminals on pressure switch.
4.Check pressure switch contacts with an ohmmeter for continuity.
A.If pressure switch contacts show
continuity (closed circuit) replace the pressure switch.
B.If pressure switch contacts show open circuit and all wiring is correct - replace the lower control.
Check all wiring to the hot surface ignitor.
2, Check the 3 pin Molex ignitor assembly plug and receptacle on the lower control
for a good connection. Repair or replace
parts if necessary.
3.Check resistance of the ignitor with an ohmmeter on the ignitor assembly plug. Replace ignitor if resistance is not within
1.72and 2.40 ohms.
4.If above checks are good - turn off
power for 10 seconds and then back on. If this error code will not clear and the ignitor resistance is within specifications
-replace the lower control.
1.Do not touch any electrical switch, do not use any phone in the building and do not try to light any appliance.
2.Smell around the water heater to ensure there
are no gas leaks at the gas control valve or in the supply gas line or for any other type of flammable vapors in the area.
3.Carefully inspect the area surrounding the
water heater for any substances such as gas- oline, paint, paint thinners, varnish, or cleaners
that could emit flammable vapors. Remove anything that can potentially emit flammable
vapors from the area and store it properly in a different location.
continued next page
39
