17
EN
Maintenance And Care
Before replacing the fuse, check for a short external to
the DSI control board.
Once the short is corrected, replace the 2 amp fuse with
a mini ATO style fuse.
I
Do not install a fuse larger than 3 amps.
If the fuse is good and the unit is inoperative, check for
excessively high voltage to the unit (more than 14 volts).
Check for low voltage, below 10 VDC, on the thermostat
line.
Inspect for and remove any debris such as dust, insect
nests, or such from the compartment burner and flue
assembly. If nests are noticed but cannot be easily
removed, contact a qualified service center.
If the previous steps did not solve the problem, check
the thermal cut-off
The thermal cut-off is a device installed in the power
supply line.
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Thermal Cut-off
This device will shut off electrical power and stop heater
operation when activated. For example, if an obstruction
within the flue tube should occur, as described in
“Performing Preventative Maintenance” on page 17,
the burner flame/heat may contact the cutoff, resulting in
a melting of the fuse element incorporated in the thermal
cut-off. In order to restore power and proper operation
of the Water Heater, the obstruction must be removed
and the thermal cut-off must be replaced.
6.2 Performing Preventative
Maintenance
Spiders, mud wasps, and other insects can build nests
in the burner tube. This will cause poor combustion,
delayed control, or flame outside of the combustion
tube and the burner assembly.
Listen for a change in burner sounds or look for changes
in flame appearance from a hard blue flame to a soft lazy
flame or one that is very yellow. These are indications of
an obstruction in the burner tube or the burner assembly.
Inspect and clean the burner tube on a regular basis. Run
a flexible wire brush down the burner tube to remove
obstructions or clean the burner tube and the burner
assembly.
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Burner Tube
