SVC 810 Tankless Troubleshooting Manual
42
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No
No
Yes
Replace transformer
Is there power
to the Printed
Circuit Board
from the
transformer?
No
Unit a
ears to be OK. Tr
to restart.
Check fused power leads next to junction box.
Is there
voltage thru
the 3 amp
fuses?
Yes
Check and verify the fused leads next
to the junction box on the black and
white wires are OK. Replace with 3
amp fuses if needed.
Measure the voltage of the wires
inside the junction box of the water
heater between the black and white
wires at 108 – 132 VAC
Measure the voltage of the two red wires on
the bottom right of the PCB @ 90 - 110 VAC.
Second Generation 4.2, 5.3, and 7.4 series
have black and white wires for this test. You
will also see a true 120 volts. The second
generation 4.2, 5.3and 7.4 series units don’t
have trans
ormer.
Yes
Replace 5 amp fuse
Is there power
to the Printed
Circuit Board
thru the PCB
fuse?
Measure the voltage thru the fuse located on the board. Measure
both sides of the fuse to ground @ 100 VAC.
The second generation 4.2 and 5.3 units do not have a
transformer; you will see 120 volts.
Did the
unit go to
main
urner?
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