General Troubleshooting
©Aqua-Hot®
250-D03 Diesel Series Service Manual
REV 220302
p. 93
General Troubleshooting
Purpose:
This section serves to solve common operational problems,
to reduce down-town and unit repair costs, by fixing the simplest
problems first.
Troubleshooting Procedure:
If your 250-D03 has been unused for an extended period
of time, performing the annual service may resolve many
problems. Instructions for the annual service are on Page 78
or may be performed by an Aqua-Hot Factory Certified Service
Center. They can be found on the website at www.aquahot.com.
• Ensure that the Aqua-Hot is supplied with electrical power.
• Ensure there is an adequate supply of fuel (at least ¼ tank).
• Ensure that the Aqua-Hot boiler tank has an adequate
supply of antifreeze and water heating solution by checking
the level at the expansion bottle. If the level is low,
reference the maintenance section of this guide for refilling
instructions.
• Verify the functionality of any in-line fuses connected to the
Aqua-Hot. Replace these fuses if necessary.
• Ensure that all RV-side hot water faucets are closed.
• Locate the controller within the Aqua-Hot unit. See Page 11
to identify this component.
• Visually inspect the interior cabinet of the Aqua-Hot
unit, searching for any damaged or disconnected wires.
Reconnect or repair any damaged wires.
• The 250-D03 contains a 20A fuse as part of the wiring
harness. Check that this fuse has not been burned out.
• Locate the high-limit thermostats and follow the procedure
on Page 26 to troubleshoot these components.
• Visually inspect the exhaust system of the Aqua-Hot to
ensure that it has not been damaged or removed.
• Test for unit operation:
○
If the burner fails to operate, proceed to Page 96 to
begin the diesel burner troubleshooting.
○
If the burner begins to operate at this stage, choose a
troubleshooting guide below based on the issue.
Lack of, or Uneven, Hot Water
A lack of hot water, or uneven delivery of hot water (hot
water that contains cold spots), is typically due to a failure of
one more of five components: the shower head, the stir pump,
the three-way valve, the low-temperature cutoff thermostat, or
the tempering valve.
• Shower Head
○
It is possible that the shower head in the RV is
drawing hot water too quickly from the Aqua-Hot,
overtaxing the unit resulting in hot water delivery
problems. The shower head should be limited at
1.5GPM max.
• Stir Pump
○
Reference Page 32 to troubleshoot the stir pump.
• Three-Way Valve
○
Reference Page 29 to troubleshoot the three-way
valve.
• Low-Temperature Cutoff Thermostat
○
Reference Page 27 to troubleshoot this component.
• Tempering Valve
○
Reference Page 31 to troubleshoot the tempering
valve.
Once these components have been diagnosed, restart the
Aqua-Hot and allow it to heat to operating temperature. Draw
hot water to determine if the problem has been addressed.
If after troubleshooting and these components are found
to be in good working condition, contact the Technical Support
Department at 574-AIR-XCEL (574-247-9235) for assistance.
You can also find a Factory Authorized Service Center for
diagnostic and repair. Find your local service center online at
www.aquahot.com.
