Atwood Mobile Products Water Heater Water Heater Exchanger User Manual

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POTTED CHANNEL CIRCUIT BOARDS
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.
THERMAL CUT-OFF DEVICE
Current Atwood direct ignition water heaters are equipped
with a thermal cut-off device. This device is located on the
incoming power wire and is connected to the thermostat. The
thermal cut-off is designed to permanently break circuit and
shut down the water heater before excessive heat can cause
damage due to obstructions in the main burner tube or flue
tube caused by spiders or mud wasps. These obstructions
can cause the main burner flame to burn outside the main
burner tube. When the flame or the heat from the flame
contacts the thermal cut-off, the circuit will open.
If there is no heat damage to the thermal cut-off, and if it is
determined defective, Atwood will cover the replacement of
this device under warranty. We will allow .25 hour at your
Atwood approved warranty rate. If there is heat damage the
device performed its safety feature and no warranty labor will
be allowed. Any obstructions should be removed, alignment
checked and gas pressure taken before a new thermal cut-off
is installed.
Note: When replacing a thermal cut-off, also examine the grill
in the access door while the door is in the closed
position. The wide aluminum band of the grill should
be at the bottom. If it is at the top, this condition may
trap exhaust heat and possibly also cause thermal cut-
off to trip. To correct, remove the grill from the door
and snap back in place with the wide aluminum band at
the bottom.
THERMOSTAT
The thermostat on this water heater is pre-set at 140° F. The
water heater will cycle off when the water temperature
reaches 140° F. and will generally take 20-25 minutes to
reach this temperature. It will cycle back on when the water
temperature cools down to approximately 115° F. In the latter
part of the heating cycle though, it is very common for the
pressure-temperature relief valve to weep. Refer to the page
covering weeping relief valves to remedy this situation.
If a customer is dissatisfied with the temperature of the
water, first check the water temperature with a cooking
thermometer and verifying that the initial cycle is within the
time noted above. If not, an adjustable thermostat may be
purchased allowing the water temperatures to be adjusted
from 110 - 150° F. It fits in place of the original thermostat.

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