York furnace Which York control board you have: York used two control board generations with different code meanings
Johnson Controls documents two integrated furnace control generations in the same service letter: the newer UTEC boards and the last-generation White-Rodgers Emerson boards. Most codes match. A few do not, and the board part number is printed on the board.
Applies to: York, Luxaire and Coleman gas furnaces. Read this before acting on a York flash code, because two board generations are in service and they do not agree on everything.
What it means
Technical service letter ST-045-09 carries two separate fault code tables, one per generation, and most of the site's York pages are written from the UTEC table. The tables agree on the large majority of codes — two red flashes is a pressure switch stuck closed on both, five red is an open rollout on both, eleven red is a limit open more than five minutes on both. The differences are few but worth knowing, and one of them changes how urgent the fault is. The good news is that this is decidable rather than a guess: Johnson Controls prints the board part numbers in the same document, and the number is on a label on the board itself.
Most common causes
- UTEC generation boards: 539617, 542760, 542766, 542767, S1-03102951001, S1-33102954000, S1-33102955000 and S1-33102956000.
- Last-generation White-Rodgers Emerson boards: 265901, 265902, 265903, 265904, S1-33109167000, S1-33109168000 and S1-33109169000.
- The generations were sold consecutively, so the age of the furnace is a rough guide but the part number is the answer.
- Both generations appear across single stage PSC, two stage PSC and two stage ECM variable speed models.
How to diagnose it
- Read the part number from the label on the control board. That settles it in one step.
- The clearest behavioural tell: on a UTEC board a steady amber heartbeat means a call for heat. On a White-Rodgers Emerson board the same condition is one amber flash, and its amber heartbeat is not used that way.
- A solid red LED differs meaningfully. On UTEC it means a control fault was detected, generically. On White-Rodgers Emerson the same indication is an internal gas valve error, microprocessor or frequency check — which points at the gas valve rather than at the board in general.
- Twelve red flashes is an open hot surface igniter on UTEC and an ignitor failure on Emerson — the same repair, worded differently.
How to fix it
- Nothing to fix here. This page exists so a flash count is read against the right table.
- Where the two tables agree, the pages on this site apply to both generations.
- Where they differ, the difference is noted on the page concerned.
Notes
Both tables use the same footnote markers, and those are worth knowing: an asterisk means the code is stored in the error code array and can be recalled later, a single hash means a one hour soft lockout, and a double hash means a hard lockout that will not clear itself.
Related
- Fault code retrieval — How to read and clear stored fault codes on York UTEC boards
- 1 amber flash — Normal operation with a call for heat, Emerson boards
All codes for this manufacturer
York, Luxaire and Coleman furnace flash codes — every code, with what differs between models.