Toto spares, Toto Parts, Toto Spare Parts, Spare code No : TCM1158-2.
TOTO spare part TCM1158-2 (also listed in some catalogs as HTCM1158-2) is the Side Control Panel Assembly for selected TOTO Washlet models. It is the user interface mounted on the side of the Washlet seat.
Part details
- Part number: TCM1158-2 / HTCM1158-2
- Part name: Side Control Panel Assembly
- Used in models:TCF4731A
- TCF9786WA
Functions
The side control panel contains the buttons used to operate the Washlet, including:
- Rear wash
- Front wash (bidet)
- Stop
- Water pressure adjustment
- Nozzle position adjustment
- Other model-specific functions such as dryer or oscillating spray (depending on the Washlet model).
Symptoms of a faulty TCM1158-2
If this assembly fails, you may experience:
- Buttons not responding
- Some functions working while others do not
- Intermittent operation
- Physical damage from moisture or impact
- Complete loss of side-panel control while the main unit still has power
If you have the TCF4731A or TCF9786WA model, I can also provide the exploded parts diagram showing exactly where TCM1158-2 is installed and how it connects to the main control board.
TOTO spare part TCM1158-2 is the Side Control Panel Assembly used on certain TOTO Washlet models. It is the built-in control interface attached to the side of the bidet seat, allowing the user to operate the Washlet without a separate wall-mounted remote.
Uses of TCM1158-2
- Controls Rear Wash and Front Wash (Bidet) functions.
- Provides a STOP button to immediately stop washing or drying.
- Allows adjustment of water pressure.
- Allows adjustment of wand/nozzle position.
- On compatible models, operates additional features such as:
- Warm air dryer
- Oscillating or massage spray
- Power ON/OFF
- Seat heating or other model-specific settings.
Purpose
The TCM1158-2 serves as the primary user interface between the user and the Washlet's electronic control system. When a button is pressed, the control panel sends the corresponding command to the main control board, which operates the appropriate valves, motors, heaters, or other components.
Common symptoms of a faulty TCM1158-2
- Buttons do not respond.
- Only some buttons function.
- Intermittent operation.
- Cracked or water-damaged panel.
- The Washlet powers on, but commands from the side panel are not recognized.
This part is commonly used with models such as TCF4731A and TCF9786WA, though compatibility should always be confirmed using the exact model number before replacement.
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