Aqua-Hot 400 Series Service Manual page 34

Electrical Heating Element:
The electric heating element uses AC power as an alternate
power source for heating the Aqua-Hot's boiler tank.
Troubleshoot the electric heating element if the following
condition has occurred:

There is a lack of hot domestic water and interior heat
when the electric element is selected as the heating
source.
 There is a lack of interior heat in the motor home..
Troubleshooting:
NOTE: For continuous domestic hot water or heating the
motor home in cold weather, the Propane-burner must be
selected as the heating source.
1. Verify that the motor home is either plugged into shore
power or that the generator is running to provide AC
power.
2. Verify that both the "Electric Heating Element Status" and
the "Heating Status" indicator lights on the electronic
controller are illuminated.
If the "Electric Heating Element Status" indicator light on the
electronic controller is not illuminated, complete the follow-
ing:

Verify that the electric element switch on the interior
switch panel is ON.

Install a jumper wires on the JP2 plug, between pin 52
and 53 ("ELECTO-O" and "ELECT-I") on the electronic
controller to bypass the electric element switch.
If the "Electric Heating Element Status" indicator light illumi-
nates on the electronic controller with the jumper wire in-
stalled, check the electric element switch on the interior
switch panel for functionality.
If the "Electric Heating Element Status" indicator light does
not illuminate on the electronic controller with the jumper
wire installed, follow the instructions in this manual to re-
place the electronic controller.

Check the temperature of the Aqua-Hot's boiler tank.
Electrical-AC
If the boiler tank temperature is below 155°F and the Heat-
ing Status Light is not illuminated, troubleshoot the control
thermostat.
If the boiler tank is above 155°F, the Aqua-Hot is at operat-
ing temperature and requires no heat.
3. Verify that the electronic controller sending is 12 Volt-
DC to the A.C. Relay.

Using a voltmeter, check pins 11 and 12 ("AC REL -"
and "AC REL+") for 12 Volt-DC on the JP3 plug.
If 12 Volts of DC power is not present while the "Electric
Heating Element Status" and "Heating Status" indicator
light on the electronic controller are illuminated, follow the
instructions in this manual to replace the electronic control-
ler.
4. If 12 Volts of DC power are present at the relay, com-
plete the following:

Locate the AC wires connected to the AC Relay and re-
move the AC wires from the relay.

Using an ohmmeter, check the relay AC pins for continu-
ity.
If no continuity exists, follow the instructions in this section
to replace the AC Relay.
5. Verify that the electric heating element is receiving ade-
quate AC power by completing the following:

Remove the AC access cover.

Plug the coach into shore power or turn on generator.

Using an AC voltmeter, verify that 110 Volts of AC power
are present at the terminal block. If there is not 110
VAC present at the terminal block for the electric ele-
ment, there is a problem inside the motor home.

Using a digital clamp-meter, verify the electric element's
AMP draw is between 11.2 to 13 AMPS.
© Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014
Section #: Title
Aqua-Hot Components
p.
34