c. Open Circuits
Although open circuits can occur in the secondary
they usually take place in the primary. If the unit
contains only one power supply and the indicating light
does not glow the outage is probably one of the
following.
(1) Supply line power to the junction box
disconnected. Reconnect.
(2) Open access door interlock in control of electronic
air cleaner. Be sure all access doors are properly
closed and secured.
(3) Blown in-line fuse located on the power supply
circuit board. Replace power supply.
(4) Outage in the power supply. Look for charred or
burned components or a loose wiring connection.
(5) Defective indicating light. Replace light.
d. Malfunctions other than short or open circuits.
Refer to trouble reference chart in this section