7.0 Troubleshooting
This section includes various conditions as well as possible solutions related to the EX unit.
Note
The boilers are equipped with a blocked vent shutoff system, which closes the gas supply upon
detection of an irregular venting condition. In such an event, the electronic controller automatically
carries out a reset/ retry every 5 minutes.
The troubleshooting section is divided into 3 sections:
Preliminary checks
Electronic components
Troubleshooting error messages
Often, a problem can be identified and solved through simple checks of the basics: confirming the electrical
power supply, gas flow and resetting the thermostat control.
7.1 Preliminary checks
The first step in troubleshooting this system should be a review of the touchscreen controller. There are a
number of diagnostic features incorporated in the software that evaluate system integrity, display error
conditions and provide initial remedial actions.
In addition to checking the display, the following list is a guideline for troubleshooting:
Preliminary Troubleshooting Checks Check
Confirm power to the boiler: check that the touchscreen controller display is on (e.g., display is lit.
The touchscreen controller’s display will be fully functional in 90 seconds after power is restored
to the boiler.)
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Check that the boiler is not in a safety lockout.
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Ensure wiring is clean and secure.
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Check that gas is reaching the unit.
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Check the gas pressure switches.
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Confirm that the water system is properly charged to 12 psi minimum, and that the pump is
serviceable.
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