(1) Check to be sure power has been disconnected from the air conditioner. Shutting the unit off at the control
panel does not disconnect power to compressor heaters.
(2) Allow heaters to cool before touching.
(3) Check quick warm up heater (HR8) and thermostat (S10) as follows:
(a) Using a multimeter, check continuity between contacts D and E on P21 connector. Continuity should
be indicated. If continuity was indicated, skip steps (b) through (d).
Figure 522. Quick Warm
Up Heater (HR8) and Thermostat (S10)