TM049 27L Continuous Flow Service Instructions
REV AL
– Issued April 2019
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76
Over Heat Limiter (OHL) Assembly: (Procedure 23)
Replacement of the OHL requires removal and possible replacement of the heat exchanger.
1. Remove heat exchanger. Refer procedure 21.
2. Inspect the heat exchanger for damage. (Replace heat exchanger if necessary)
3. Remove the two white wires from the terminal block on the right hand side of OHL.
4.
Outdoor Model:
Remove the two plastic rivets retaining the overheat limiter assembly
to the back of heater cabinet and remove the overheat limiter assembly.
Indoor Model:
Remove the three screws retaining the overheat limiter assembly to the
air intake hood and remove the overheat limiter assembly.
5. Reassemble in reverse order of above
6. Reposition the Overheat Limiter as per the following procedure. Failure to follow this step
may lead to premature OHL failure.
When closing the OHL the short end should be at the
front and joined at position 0 (refer to fig 1) for both
indoor and outdoor models.
The long end of the OHL must then be positioned on the
cable guide retained by the top left screw on the
combustion chamber front panel (refer to fig 2) at the
positions noted below;
For all 27L indoor models position
8
must sit on the
cable guide (refer to fig 3).
For all 27L outdoor models position
2
must sit on the
cable guide (refer to fig 4).
Note: Ensure all multi-pin plugs are reconnected and all
wiring is neatly repositioned and retained to prevent
damage during operation.
Incorrectly setting or positioning the OHL may lead to a
nuisance failure (open circuit), resulting in error code 14
being displayed and rendering the water heater
inoperable.
Fig 1
Fig 2
Fig 3
Fig 4
