FieldBench
Rheem codes

Rheem

93

Lockout

Internal control

IFC self-fault.

Walk 93 in Diagnose

7 plates — walk the one on the cabinet

First check

1 Write the live code and watch one cycle

On Rheem R951T read Rheem/Ruud 2-digit IFC (TA / CT) before you pull power. Write 93 exactly. Watch one full sequence and note which step dies. Write every stored code first. 93 after 11/45/57 is often a drowned or hammered board, not a first-swap.

Expect: W1: Inducer low → 45 if the low/intake switch never closes → HSI → valve → 11 if no prove, 12/13 if flame is weak or drops.

The rest of the walkthrough is Diagnose.

On the plates

  • Write every stored code first. 93 after 11/45/57 is often a drowned or hammered board, not a first-swap.
  • Line voltage, polarity (26), wet control from a 96% leak.
  • Stored stack first. Wet board, polarity (26), persistent input.
  • Do not confuse 93 with an EcoNet-stat blank.
  • Stat log + board digits. Persistent 93 after a clean power-up is the control.
  • Wet board from a 98% leak, polarity, leftover 24V landing on the data pair.

Plates that use 93