Upgraded Bryant Furnace Control Circuit Board HK42FZ004 August 21, 2025upgradedboard, bryant, circuit, control, furnace, hk42fz004, upgradedadmin OEM REPLACEMENT FOR HK42FZ034 HVAC FURNACE CONTROL BOARD. Share ← Glasfloss 16-3/8 x 21-1/2 x 1 MERV 10 Air Filters for Carrier, Bryant, Payne HK42FZ009 Furnace Control Board 1012-940-J Carrier Bryant Payne (Refurbished) →