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Failure/Alarm. Description of failure. Possible causes. Troubleshooting / Repair method. Obs. 1. Nothing displayed on control panel. (blank) Unit is not working Building Re-Tuning Training Guide: AHU Discharge-Air. Temperature Control. Summary. The purpose of the air-handling unit (AHU) discharge-air temperature The following table (see Table 1) gives recommended maintenance intervals for the air handling unit. Intervals are base upon normal running conditions, in a AHU*-SG2. CPR*CD(O) Troubleshooting. The unit changes from. COOL/HEAT mode to. FAN mode for installation on the AHU internal machine.4.3 Replacing the control board. 62. 4.4 Temperature sensors. 64. 5.0 Troubleshooting. 67. 5.1 Measuring voltage on AHU boards. 67. 5.2 Pump not energized. Do not try to make any kind of maintenance activity before the electricity is cut and fan security is supplied. In general Standard AHU units (Except hygienic 3.1 PROCEDURE FOR TROUBLESHOOTING . 3.3 MASTER TROUBLESHOOTING CHART. In general air handling unit do not require special attention other then Service Information, Troubleshooting --. Pitot Tube, Inlined Manometer, Minihelic Filter Gauge Krueger's air handling unit (AHU) is manufactured to the. in some cases for troubleshooting. Fan Status Monitoring. GENERAL — The A Series ComfortLink controls offer the capability to detect a failed supply fan The Johnson Controls Air Handling Unit (AHU) Controller is a complete Troubleshooting Guide Technical Bulletin in FAN 636.3 or Controller. This publication contains operation and troubleshooting in- formation for PIC (Product Integrated Control) 5, a system for controlling 19XR semi-hermetic Troubleshooting Excel 10 Controllers and Wall Modules 48 Typical W7750A Controller AHU application wiring. Troubleshooting Excel 10 Controllers and Wall Modules 48 Typical W7750A Controller AHU application wiring.