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XIV. Troubleshooting
The following pages contain trouble shooting tables for use in diagnosing control problems. When using these tables
the following should be kept in mind:
1) This information is only meant to be used by a professional heating technician as an aid in diagnosing boiler
problems.
2) Where applicable, follow all precautions outlined in the Section XI (Start-up and Checkout).
3) All controls on the boiler are tested at least once in the manufacturing process and a defective control or
component is generally the least likely cause. Before replacing a component, try to rule out all other possible causes.
A. Using the Diagnostics Menu
The plain text display provided with this boiler provides an easy means of identifying most common problems. In the event that
the control system detects a problem, such as an open limit or defective sensor, the Active Fault button shown in Figure 14.0 will
appearandashonboththeHomeScreenandtheBurnerStatusScreen.TouchingeitherActiveFaultbuttonwilltaketheuserto
theDiagnosticsMenu.Fromhere,presstheashingbuttononeachsuccessivescreentoreachalistofpossiblecauses.Inthecase
of a defective temperature sensor, a defect indicator will also show up on the status screens where the corresponding temperature
is normally displayed. See Figure 14.0 for an example of this.
The complete Diagnostics Menu is shown in Figure 12.7. The screens on this menu provide the following information:
1) For Service Contact - Displays the service contact information entered in Section XII, Step D.
2) About - Displays the software versions for both the boiler control (R7910B) and the display
3) Fault Menu - Provides status of different types of faults by category. When a particular fault exists, the button for that
categoryoffaultswillash(seeFigure14.0foranexampleofafaultysupplysensor).IntheexampleshowninFigure
14.0,boththeSensorandSoftLockoutbuttonsashontheFaultMenubecauseadefectivesupplysensoralsocausesasoft
lockout. Fault categories include:
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