Pitco SELVRF Trouble-Shooting And Service Manual page 15

BEFORE SERVICING, REFER TO PAGE 3 AND 4 OF THIS DOCUMENT FOR IMPORTANT NOTICES
COMPONENT TROUBLESHOOTING (CONTINUED)
1. Auto Filter Board Heat Circuit: Refer to Figure 6. Verify the auto filter
board has DC voltage by checking for the flashing green led (LED7). If
the LED is not flashing, then no DC power is present.
To check the heat circuit of the auto filter board (Lower left corner):
1. Verify the Left AC Power LED is lit, located just above the fuse. If the AC
LED is not lit, verify 24VAC - 28VAC at J1, blue wire to white wire. This
voltage comes straight from the transformer. If no voltage, troubleshoot
the transformer. If voltage is present, verify the fuse is good.
2. On J136, verify that either a jumper is installed, or if two white wire,
unplug J136 and check the white wires for continuity. If no continuity on
the white wires, check the float switch operation. Also ensure
jumpers are installed on J129 and J18.
3. Turn the controller on. Verify 24VAC - 28VAC on J32, yellow wire to
white wire. If present, continue to step 4.
a. If no voltage is present, verify that the LEFT SIDE ON LED is
lit.
I. If lit, the relay board is bad and needs to be replaced.
II. If the LEFT SIDE ON LED is not lit, check that the jumper
is installed properly on J18 and that the float switch is
in the closed (up) position. You can verify this by
following step 2 above.
III. If the LEFT SIDE ON LED is still not lit, either the
Auto Filter Board, Controller or Commlink cable has
failed. No electrical testing exists for this failure.
Swap one component at a time with a known working
component to determine the failure.
4. Check the J32 connector from brown/white wire to white wire for 24VAC
- 28VAC. If present, the safety (side on) contactor should be closed.
Continue to step 5.
a. If no voltage is present, try to reset the hi limit.
b. If no voltage is present after resetting the hi limit, either the hi
limit has failed or a wire connection issue is present.
5. With the controller calling for heat (LED next to thermometer on
controller is lit), verify 24VAC - 28VAC on J32, red wire to white wire. If
voltage is present, the cycling (heat demand) contactor should be closed.
The heat circuit is complete and the elements should be energized.
a. If no voltage is present, verify the LEFT HEAT DEMAND LED is lit
on the auto filter board. If the LED is lit, the relay has failed and
the auto filter board must be replaced.
b. If the LEFT HEAT DEMAND LED is not lit, either the Auto Filter
Board, Controller or Commlink cable has failed. No electrical
testing exists for this failure. Swap one component at a time
with a known working component to determine the failure.
J1
J32
J34
J129
15
Figure 6
L22-405