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THE PROBLEM THE CAUSE THE SOLUTION
No air or not
enough air coming
from blower(s)
(Continued)
7. If all previous tests are normal, then
blower motor has failed. Replace.
Blower motor(s) failed
ON, disconnect main power cord or circuit
breaker for 1 minute. If "FAULT" light
persists, and all previous tests show
normal, speed control can be tested in the
following manner: swap motor wires from
"good" speed control to "bad" control, and
see if blower motor works. If YES, then
"FAULTY" control is bad and needs
replacing. If NO, then "FAULTY" control is
OK, and motor may need replacing.
6. Test potentiometer by swapping "bad"
pot to "good" speed control. If motor then
works properly, pot is OK, and other speed
control needs testing. (model VHVA-Series
only).
Wire connections broken or loose between
potentiometer and speed control
at the header terminal on speed control
board.
4. One pot wire contains a 15K ohm
resistor at the pot body. Verify this solder
connection is good.
Blower speed control(s) failed
5. Blower(s) can stop if speed controls
have not been reset (model VHVA-Series
only). If yellow "FAULT" light on speed
control circuit board is ON, first turn OFF
main Switch for 15 seconds to rest
control(s). If yellow "FAULT" light remains
CAUTION: THE FOLLOWING TESTS 1-
4 ARE PERFORMED WITH LIVE POWER
WITH CONTROL BOX OPEN, OR REAR
MOTOR COVER REMOVED. THESE
TESTS TO BE PERFORMED ONLY BY
AN AUTHORIZED SERVICE AGENT.
1. Speed control wire connections are
labeled U, V, and W. Insure connectors
are tight.
2. Insure these (3) wires are tight on
terminal block located in blower motor
compartment.
3. Tighten wires from pot to speed control
Wire connections broken or loose between
blower motor(s) and terminal block.
Wire connections broken or loose between
speed controls and blower motor(s)
(model VHVA-Series only)