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Turn on the service switch and attempt to run the heater.
Proceed to Q8.
Q8: Does the heater fire once the plunger from the fuel solenoid is
removed?
IF YES:
Problem solved. Replace the fuel solenoid. To replace the
fuel solenoid, refer to 5.3.1.
IF NO:
Contact Calcutt Boats for further assistance.
When the Heater attempts to fire, a stable flame comes on for 7
seconds. After 7 seconds the heater flames out.
IMPORTANT: Disconnect the main power (12VDC) from the heater.
Disconnecting the 12VDC power ensures that the heater will not attempt
to fire if the heater is accidentally turned ON. If the heater were to
attempt to fire with the front cover off, it will project open flame towards
the user.
Remove the screws on the front cover and remove the cover. Check that
the connections to the RED, BLACK, and YELLOW wires on the flame
sensor (see 5.3.4) are secure. This connection will have YELLOW heat-
shrink on both sides of the matching connectors. Proceed to Q1.
Q1: Are all flame sensor connections secure and correct?
IF YES:
1.
Disconnect the flame sensor wires and unscrew
(counter-clockwise) the flame sensor from the fuel block.
2.
Check for soot build-up on the flame sensor eye.
3.
Check for soot build-up in the flame sensor hole in the
fuel block (using a flashlight). This hole should have a
clear line of sight into the burner chamber. Proceed to
Q2.
IF NO:
1.
Correct the connections.
2.
Screw front cover back in place.
3.
Connect the main 12VDC power to the heater.
4.
Attempt to run the heater.
Q2: Does the flame sensor eye have soot on it, or is soot blocking the
flame sensor hole in the fuel block?
IF YES:
1.
Clean the soot off the flame sensor eye.
Summary of Contents for SCH25
Page 6: ...Page 2...
Page 9: ...Page 5 BURNER COUNTERFLOW TUBE COMBUSTION CHAMBER NOZZLE...
Page 16: ...Page 12 Figure 3 Wiring Diagram...
Page 34: ...Page 30...
Page 41: ...Page 37 Appendices Appendix 1 Technical Bulletins...
