28 11112014GW
Code 58 Troubleshooting Procedure
Secondary Heat Exchanger Sensor
A code 58 will appear when one of the two bi-metals opens on the secondary heat exchanger opens.
These bi-metals are located on the rear of the secondary heat exchanger where the air box connects to
the heat exchanger. The code 58 will appear regardless to whether or not the unit is in operation. To
reset this code you must correct the problem with the bi-metal switch first. Then you have to turn the
power off to the appliance and then turn it back on. This is called a hard reset.
1. Check sensor wiring harness for loose, broken or damaged connections from sensor back to PC
board.
2. This code indicates a scale build-up inside the secondary heat exchanger and it needs to be
flushed to prevent damage. Refer to flushing instructions in the owner manual. Hard water must
be treated to prevent scales build-up or damage to the heat exchanger will occur.
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