Status code46Rheem
What it means
Low pressure switch open with inducer on low speed.
Call a profurnace
How it shows: Dual 7-segment display: 46
§1Likely causes
- Blocked or improperly terminated vents
- Vent length or elbows exceed maximum
- Faulty or disconnected inducer
- Faulty control board
- High altitude kit not installed
- Loose or faulty wiring
- Damaged pressure switch hoses
- Wind gusts
- Faulty pressure switch
§2Safe DIY steps
- Check outdoor vent terminations for blockage
- Techniciancheck venting, inducer, hoses, high-altitude kit need and pressure switch
Safety firstIf you smell gas, do not touch any electrical switch or use a phone in the building; leave immediately and call your gas supplier from outside. Turn off electrical power at the furnace switch or breaker before opening any panel, and never bypass or jumper a limit, rollout or pressure switch. Gas valve, burner, venting, wiring and control-board work should be done by a licensed HVAC technician.
§3When to call a pro
Call a licensed HVAC technician: if vents are clear and the code persists.
Find a local HVAC pro →§4Other Rheem codes
10Rheem
One-hour lockout, caused by repeated failed ignition (11), water sensed (59), dead blower (61), internal fault (93), flame lost 5 times (13) or unexpected flame (14).
11RheemFailed ignition. After four failed attempts the control enters one-hour lockout (10).
12RheemLow flame sense: flame sense current is weak or marginal. Furnace keeps running.
13RheemFlame lost after established.
14RheemFlame present with gas valve off. Extremely critical; furnace will not operate.
30RheemOpen fuse, usually from a 24 VAC short to common or ground.