Customer had issues with Navien boiler error code E110 Customer had issue with Carrier Furnace error code E32 Customer has issue with Navien boiler giving error code of E110 customer had boiler unplugged (Turned off) Inspected fresh air intake screen for blockage: washed and re-installed. Inspected hose connection for holes or breakage. All good. Remove and clean condensate drain. Drain was dirty. Re-Installed all components. Ran and tested Navien boiler operation. Boiler fires, no running. Boiler is no longer presenting error code. System is back to normal operation. Customer also had issue with Carrier furnace. Upon arrival furnace was already turned off @ emergency switch. Put power to equipment. Furnace tried to fire. System is giving error code 32 indicating that pressure switch did not close or open. Removed and checked pressure switch. Clean condensate drain line free of water or obstruction. Checked control board for correct voltage @ terminals R & C, R & W, R & G when system