924.xx Service Fuser Error on a Lexmark T64x Series Printer

Explanation

A 924.xx
error message indicates that an "open circuit" has been detected in the fuser unit.

What to do

If this is the first time you have seen the error, turn the printer off.

Leave the printer off for at least 10 seconds to give it a chance to reset, then turn it back on.

If this does not clear the fuser error, the printer will probably require service. The parts most likely to be causing this error are the following: the fuser unit
the system board
the low voltage power supply
unit
. These parts will need to be inspected by a service technician and replaced as necessary.
IMPORTANT!
If this is an intermittent error, you may want to check how the printer is plugged into the wall. Make sure it is plugged straight into the wall and not through a surge device or power strip. Verify also whether the printer works on a 110 or 220 volt source by checking its Power Label on its back and ensure that the power outlet matches its working voltage rating.

Please carry out this test even if the printer has worked properly at its power outlet in the past. Power strips and uninterrupted power supplies can cause a low amperage condition to occur within in the printer, which can trigger a false fuser error.

Still need help?

Please contact Lexmark Technical Support if you need additional assistance.
NOTE:
When calling for support, you will be asked for your machine/model type
and serial number
(SN). If you need help locating these

Please call from near the printer in case the technician on the phone asks you to perform a task involving the printer.

LEGACY ID: SO2939

Error Code (x = any number)	Description of Problem	Possible Root Causes	Possible Diagnosis and Repair Actions	Recommended Parts
924.x0	Open thermistor check.			First service call: Recommend replacing the fuser assembly. If the fuser unit has already been replaced, recommend replacing the LVPS and the system board next.
924.x1	Open thermistor check failure.	Noisy thermistor signal Intermittent connection Thermistor cable not connected or thermistor actually open	Check thermistor, circuit, and cabling for improper or loose connections. Also check for possible sources of signal noise. Check thermistor circuit for proper components (wrong values for pull-up resistors, etc.)	First service call: Recommend replacing the fuser assembly. If the fuser unit has already been replaced, recommend replacing the LVPS and the system board next.