Troubleshooting
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6. Troubleshooting
General Information
This section describes trouble shooting procedures for the water heater DBW 2010. Trouble shooting is normally limited to
the isolation of defective components.
Heater Test Unit 440.280
The tester unit has been designed to quickly check the proper operation of the various heater components. By using the
tester in place of the heater control unit, you are able to manually control the heater to test components and actually
operate the unit in heating mode.
The actual testing is completed in two steps, first you do an individual component test and then a manual start and run test,
both designed to pinpoint actual problems in the heater system.
1 LED - input power to heater
2 LED - control thermostat
3 LED - flame detector
4 On/Off switch water pump
5 On/Off switch motor
6 Push button - ignition spark coil
7 Push button - fuel solenoid valve
Before trouble shooting, check for and eliminate these defects:
• - fuel supply (plugged fuel filter)
• - corrosion on battery terminals
• - corrosion on electrical wiring and fuses
• - corrosion on connector
• - loose contact on connector
• - wrong crimping on connector
• - shut down initiated by temperature limiter
(automatic reset)
Trouble shooting requires extensive
knowledge about structure and theory
of operation of the heater components
and may only be performed by skilled
personnel.
CAUTION
NOTE
After any repair of a defect, a
functional test must be performed
prior to use.
Fig. 16 DBW 2010 Test Controller
NOTE
Make sure Water Pump and Motor
switches (4,5) are in “OFF” position
before connecting to heater.
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