Responded to ongoing no heat issue in Lennox furnace. Diagnosed failure caused by missing strip inside secondary heat exchanger tubes, which allowed excessive heat concentration on collector box causing it to melt and crack. Replaced collector box to restore heat, documented issue with photos, and recommended contacting manufacturer regarding the defective secondary heat exchanger to prevent recurrence.
Responded to no heat complaint where home temperature was 58°F despite recent thermostat repairs. Diagnosed multiple zone system failures in 14-year-old Carrier furnace, including failed zone panel, dampers, and motors. Replaced zone panel and installed 2 new zone motors and controls under warranty, restoring proper heating function to all zones before anticipated cold weather.
Diagnosed furnace pressure switch errors causing intermittent heating failure. Found pressure switch operating at critical threshold (1-1.3), close to limit. Corrected venting issues by adding higher vent on condensate trap per manufacturer specifications and installed 90° elbow at exhaust to improve orientation. System operational after service but noted pressure readings remain close to switch limit threshold.
Responded to call regarding 3-year-old furnace not maintaining temperature at night despite running. Diagnostic inspection revealed normal operation with good CO levels and proper ignition sequence. Verified filter was clean. Inspected internal components including wiring connections and visual inspection of heat exchanger. Unit is functioning correctly but may require further monitoring to determine if additional adjustments are needed for overnight temperature maintenance.
Replaced faulty HZ322 TRUEZONE PANEL with new control board per PO #197474-001. Installation completed successfully; however, encountered connectivity issues with third thermostat. Scheduled follow-up with electrician to resolve remaining zone connection problem and verify if thermostat requires updating.
Performed annual maintenance on 1-year-old furnace system. Conducted electrical testing with multimeter to verify proper voltage and connections. Measured gas pressure using dual port manometer, confirming readings within manufacturer specifications (11.7/2.4). All components functioning normally, no issues identified.
Responded to service call for non-functional furnace in a multi-zone Honeywell system. Diagnostic testing revealed system receiving 24V but not initiating heating cycle, likely due to moisture damage. No error codes present on furnace. Examined zone controller (HZ322) and internal wiring connections. Information forwarded to parts specialist for control board replacement estimate.
Diagnosed water leak from humidifier shut off assembly caused by damaged compression fitting, adapter, and a stuck open valve. Cut out damaged section of tubing, installed new adapter and compression fitting to stop the leak. Verified proper furnace operation and confirmed humidifier is now functioning correctly.
