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Troubleshooting the electronics of the basket lift is the process of verifying current flow through the
individual components up to and including the motor. Using a multimeter set to the 250 VAC range, check
the connections on both sides of the component for the presence of the applied line voltage. The wiring
diagram on the pages 1-44 and 45 identifies the components and wiring connection points.
1.11
Troubleshooting Guides
The troubleshooting guides on the following pages are intended to assist service technicians in quickly
isolating the probable causes of equipment malfunctions by following a logical, systematic process. An
additional set of operator troubleshooting guides are contained in Chapter 7 of the OCF30 Series Installation
and Operation Manual. It is suggested that service technicians thoroughly familiarize themselves with both
sets.
1.11.1 Troubleshooting the 24 VAC Circuit
Prior to checking for problems associated with the 24 VAC circuit, ensure that the unit is connected to a
power supply, the drain valve is fully closed, and the controller is on and is calling for heat (green dot appears
under heat indicator and display toggles between LOW TEMP).
NOTE: All voltage measurements must be made within 4 seconds of the unit calling for heat. If unit does not
fire within 4 seconds, ignition modules will lock out and controller must be turned off, then on to reset.
The following processes will assist you in troubleshooting the 24 VAC circuit and ruling it out as a probable
cause:
24 VAC is not present on the interface board J3 pin 9 (LED 5 (GV)).
1. If LED 3 is not continually lit, the probable causes are a failed 24 VAC transformer or failed wiring
between the transformer and interface board.
2. If LED 3 is continually lit, check the right PWR terminal (LED 4) for 24 VAC. On dual units, also
check the left PWR terminal (LED 2) for 24 VAC. Verify that the F2 fuse is not blown.
a. If 24 VAC is not present, the probable cause is a failed interface board, blown fuse or a defective
heat relay.
b. If 24 VAC is present, check for 24 VAC on V1S (or V1D and V2D, if dual unit). .
i.
If 24 VAC is not present, check the fuses. If they are good, the probable causes are failed
ignition module(s) or a failed interface board. Replace the questionable ignition module with
one known to be good to isolate the cause.
1-23
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Table of Contents
Troubleshooting
