Atwood **potted circuit boards can be tested using a
multi-meter. This test must be performed with the
circuit board removed, and the meter set to the ohms
scale. This will check the continuity of all tracks on
the harness connection of the board.
The following steps should be used to test each track.
A. Cross leads of meter to ensure it is registering
continuity.
B. TO TEST POWER TRACK:
Place negative lead of the multi-meter to ground (green
wire) track of edge connection and positive lead of the
multi-meter to top power (brown wire) track of edge
connection. If no continuity, board is defective. *Atwood
does not warranty this installation related failure.
C. TO TEST LAMP TRACK:
Place negative lead of the multi-meter to ground (green
wire) track of edge connection and positive lead of the
multi-meter to lamp (blue wire) track of edge
connection. If no continuity, this indicates blown lamp
track. Circuit board will still fire unit but lamp light will
not come on. This is caused by a short in the blue wire
between the unit and the switch. Wiring must be
corrected before the board is replaced. *Atwood does
not warranty this installation related failure.
D. TO TEST VALVE TRACK:
Place negative lead of the multi-meter to ground (green
wire) track of edge connection and positive lead of the
multi-meter to valve (red wire) track of edge connection.
If no continuity, this indicates a blown valve track.
• If the valve wire is shorting under the flue box –
Atwood will warranty the board.
• If the E.C.O. terminals are contacting the drawn pan
– Atwood will warranty the board only if the inner
tank of the water heater was installed flush on the
floor of the coach.
• If the inner tank of the water heater does not rest
flush against the floor of the coach –*Atwood does
not warranty this installation related failure.
* Installation related failures on circuit boards are the
responsibility of the coach manufacturer.
** Non potted circuit boards can be checked by turning the
board over and visually inspecting each track for a burn
mark or break in the track itself. A burn mark or broken
track indicates the board is blown. Depending on which
track is blown determines whether it is covered under
Atwood’s warranty as stated in section B, C and D. Use this to test. But I would clean every electrical connection and would believe it is a corroded connector before a bad board. Hope this helps.