Ice full alarm false triggering
In this guide, I’ll walk you through the steps to fix the ice full alarm false triggering on your Bosch B36CT80SNS (French Door). With the right tools and a bit of patience, most homeowners can complete this repair in 1–2 hours, saving you from a potentially costly service call.
🔨 Pro Tip from Dave
On the B36CT80SNS, the infrared ice level sensor (part 12013580) often gets coated with frost and debris, mistakenly signaling a full bin. I frequently see mistakes where the ice maker assembly is replaced without checking this sensor first — don’t make that error. Clean both the emitter and receiver eyes with a dry microfiber cloth and ensure that the wire harness hasn’t become disconnected before ordering new parts.
Part of our Top 20 Refrigerator Models & Common Repair Issues Guide. Browse all refrigerator repair guides for related models and issues.
Common Symptoms & Causes
When dealing with the Bosch B36CT80SNS, these symptoms can indicate a false triggering of the ice full alarm:
- The refrigerator sounds a continuous alarm even though the ice bin is only partially full or completely empty
- The ice maker stops producing ice while displaying an “Ice Full” status on the control panel
- Manually resetting the alarm clears it temporarily, but it returns within hours without explanation
- The ice bin slides out and reseats correctly, yet the false alarm persists immediately after
Typically, this issue is due to a faulty or misaligned ice level optical sensor, a buildup of frost or debris blocking the sensor beam, or a failing ice maker control board that misreads sensor input.
Safety First
- Unplug the refrigerator from the power outlet before starting any repair — never work on a live appliance.
- Shut off the water supply valve before disconnecting any water lines or hoses.
- Wear work gloves when handling metal brackets, sheet metal edges, or sharp components.
- Take photos with your phone before disconnecting any wiring harnesses or connectors.
- Work in a well-lit area with enough space to lay removed panels flat.
Tools & Parts Needed
Essential Tools
- Phillips #2 screwdriver
- ¼” nut driver
- Needle-nose pliers
- Multimeter
- Flashlight or work light
Replacement Parts
- Ice maker assembly
- ice-level optical sensor
- soft dry cloth
- multimeter
Step-by-Step Repair Instructions
Step 1
Start by removing the ice bin completely and visually confirming it is not full. With the bin empty, wait 30–60 seconds to see if the ‘Ice Full’ alarm still triggers — if it does, the ice-level sensor is falsely signaling rather than reacting to actual ice. I recommend doing this test first so you’re not chasing a wiring or sensor fault when the real cause is just an overfilled or jammed bin.
Step 2
Next, locate the optical sensor pair — an infrared emitter and receiver mounted in opposite walls of the ice maker cavity — and wipe both lenses firmly with a dry, lint-free cloth. Condensation, ice fog, and fine ice dust can coat the lenses, blocking the IR beam and causing the control board to interpret it as a full bin even when it’s empty. Safety note: unplug the refrigerator or disable the ice maker before reaching into the cavity to avoid contact with the auger or ejector blades.
Step 3
If your model uses a mechanical bail arm instead of an optical sensor, find the wire arm that pivots up when the bin fills and down when it’s empty. Make sure the arm swings freely through its full range of motion — a bent or obstructed arm that’s stuck in the downward position continuously signals a full bin to the control board. Gently straighten a bent arm by hand; if it’s cracked or the pivot is broken, you’ll need to replace the ice maker assembly.
Step 4
Reset the ice maker by pressing and holding the small recessed reset button on the face of the ice maker module for 5–10 seconds until you hear a beep or see the LED flash, indicating the control board has cleared its stored alarm state. This step is crucial because the board will continue to alarm even after fixing the root problem unless the memory is cleared. If you can’t locate the reset button, check the B36CT80SNS service sheet — on some models, the button is behind a small flip-down cover on the left side of the module.
Step 5
If the alarm returns after cleaning the sensor and performing the reset, it’s likely that the optical sensor has failed internally and is generating a false signal regardless of lens condition. On Bosch models, including the B36CT80SNS, the infrared emitter and receiver are integrated into the ice maker assembly and aren’t available as separate service parts. Replacing the entire ice maker assembly (Bosch part number verified against your unit’s serial tag) is the right next step; don’t attempt to splice or bypass the sensor, as this can cause the bin to overflow and damage the fresh-food compartment.
Step 6
Finally, reinstall the ice bin firmly until it seats and clicks into the drive coupling, then plug the refrigerator back in and give the ice maker up to two hours to confirm normal operation without false alarms. Watch for the first harvest cycle — you should hear the ejector motor run and ice drop into the bin without the alarm triggering. If the alarm goes off again within that time with the bin clearly empty or only partially filled, double-check that the bin is fully seated, as a misaligned bin can obstruct the optical path and mimic a sensor fault.
Where to Buy Replacement Parts
- Bosch B36CT80SNS ice maker optical sensor replacement
- Bosch refrigerator ice maker assembly 11024619
- Bosch refrigerator ice maker 12028493
When to Call a Professional
If you’ve gone through all these steps and the issue persists, the problem might involve the sealed refrigerant system, a failed main control board, or faulty wiring that requires specialized diagnostic equipment. In this case, I recommend contacting a licensed appliance technician — attempting sealed-system repairs without proper certification is illegal and could be dangerous.
How Much Does This Repair Cost?
| Repair route | Typical cost |
|---|---|
| Do it yourself | $10–$60 (parts) |
| Professional repair | $150–$300 (parts and labor) |
DIY repairs for a false ice full alarm on the Bosch B36CT80SNS typically cost between $10–$60, covering parts like a replacement ice level sensor or control board component. A professional service call generally runs $150–$300, including labor. By tackling this repair yourself, you could save $100 or more.
Frequently Asked Questions
Why does my Bosch B36CT80SNS keep triggering the ice full alarm when the bin isn’t full?
The ice level sensor or its wire harness is likely dirty or misaligned, causing it to incorrectly detect a full bin. Cleaning the sensor and ensuring it sits properly in its bracket usually resolves the false alarm.
How do I reset the ice full alarm on my Bosch French Door refrigerator?
Press and hold the Alarm button for three seconds to silence and reset the alert. If the alarm returns quickly, that means the underlying sensor issue still needs to be addressed.
Can a faulty ice maker sensor on the B36CT80SNS affect ice production?
Absolutely, a malfunctioning ice level sensor can signal the ice maker to stop producing ice prematurely. Replacing or recalibrating the sensor should restore normal ice production.
Recommended Products
Here are the parts and tools I recommend for this repair, based on compatibility and customer reviews:
- Replacement 11024619 Ice Maker Assembly for Bosch Freezer Refrigerator, Replaces AP6286855, 00748714, 11007018, 4581109, PS12367700
- Bosch 12028493 Refrigerator Ice Maker
The Optical Sensor That Stops B36CT80SNS False Ice Full Alarms
If cleaning and realigning the sensor doesn’t eliminate the false alarm, the optical sensor itself has likely drifted out of spec or developed an internal fault—this is the part I rely on when a reset alone won’t resolve the issue with this model. Ordering the correct Bosch-spec sensor will save you from chasing phantom ice maker problems later on.
What works
- Direct OEM fit for the B36CT80SNS—no adapter or workaround needed, just swap it out and reset the ice maker cycle.
- Stops the nuisance alarms immediately once installed, even on units where the old sensor seemed visually clean but was electrically dead.
- Eliminates the back-and-forth of testing and re-testing; replacing a faulty sensor provides certainty faster than troubleshooting marginal readings.
What doesn’t
- Won’t help if the alarm is actually caused by ice maker motor failure or a cracked auger—check those first before ordering a new sensor.
- Requires disconnecting power and removing the ice maker housing, which takes some patience on this model; it’s not a five-minute job if you’re unfamiliar with the interior layout.
I’ve seen homeowners order this sensor only to realize their actual problem was a misaligned ice maker tray, so take a few minutes to confirm the sensor lens is genuinely dirty or blocked before assuming it’s completely failed. Once you’re convinced the sensor is the issue, ice-level optical sensor is the right choice.
About This Article
Written by Dave Holt. Dave Holt has been taking apart and fixing household appliances since he was a teenager who couldn't leave a broken one alone. Eighteen years later, after fixing things for neighbors, friends, and anyone who'd let him, he's seen almost every failure mode there is. When he writes a repair guide here, it's based on the actual job, not a manufacturer overview. More about this site.
Scope and limits. Dave is a self-taught repairer, not a certified appliance technician. Unplug before you open anything, and leave sealed refrigeration systems, gas connections, and hardwired circuits to a qualified technician.
