Service manual

14
! WARNING - SHOCK
HAZARD
DANGER
12. ELECTRICAL DIAGNOSTIC FLOW CHARTS
6535 SERIES
With the use of these flow charts, you will be able to quickly
identify a non-working problem. Determine if the problem is
high or low voltage and then solve the problem.
IMPORTANT NOTICE
When using a jumper wire to diagnose
a low voltage problem, Never Short
Any Positive Terminal to Ground or
the Terminal Marked “B”. Serious
thermostat or P.C. Board damage may
occur.
To use these flow charts, start at the top left corner. Check
what is indicated in that box. If the answer to what is indicated
is No, work horizontally until you find the problem. When the
answer is Yes or OK, work the chart downward until you
locate the problem. Do Not Move Downward on any chart until
all preceding steps have been confirmed good. Do Not start in
the middle of any chart without knowing everything previous
(upward on the chart) is OK or you may replace the wrong
part.
To prevent the possibility of severe personal injury, death, or equipment damage due to electrical shock,
always be sure the power supply to the appliance is disconnected before doing any work on the appliance.
This can normally be accomplished by switching the breaker for the air conditioner to off, disconnecting all
external electrical connections and cords, switching on board electrical generators and INVERTOR to off,
and removing the cable from each positive terminal on all storage and starting batteries.
SOME DIAGNOSTIC TESTING MAY BE DONE ON ENERGIZED CIRCUITS. ELECTRICAL SHOCK
CAN OCCUR IF NOT TESTED PROPERLY. TESTING TO BE DONE BY QUALIFIED TECHNICIANS
ONLY.