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Central Ducted Fujitsu Heat Pump: Use the Wall Thermostat Sensor instead of the Air Handler's Sensor

If you have a central ducted Fujitsu Heat Pump with a wired remote control unit (wall thermostat), you may know that the central air handler’s temperature sensor is used by default instead of the wall thermostat’s temperature sensor. If your wall thermostat doesn’t have the thermometer icon at the display’s bottom center, then your Fujitsu is probably using the air handler for temperature. You may have noticed that the wall thermostat’s scheduled temperature almost never matches the home’s actual air temperature. In my case, temperature readings at the air handler were very unreliable at ~±5ºF. So if you want to use the wall thermostat for a (very likely) more representative sampling of your home’s air temperature to better control the heat pump, here are the instructions from a post on Reddit:

Here are a few other settings you should make sure you have set as well:

Use indoor controller to measure indoor temperature instead of air handler sensor:

Room temperature sensor switching (function 42) set to "01" (both).

Room temperature sensor switching (function 48) set to "01" (wired remote controller).

After setting 42 and 48. Turn off heat pump and switch the breaker off for air handler and heat pump for 5 minutes. Then turn back on and wait 5 minutes until controller turned on fully. In the settings of the remote controller, in "Initial Settings", hit next page, click "R.C. Sensor" (temperature sensore of controller), click "used". Then in default view of controller you should see a temperature symbol pop up at bottom of screen. Using the air handler temperature sensore will cause short cycling of your heat pump and this lowers efficency.

Before I set my Fujitsu heat pump to use the wall thermostat's temperature sensor, I could not keep my home’s climate precisely where I wanted it. There was too much variation in what the air handler’s temperature sensor would measure. That makes sense as the sensor is very near or even in an unconditioned space (though the air handler intake is insulated, the sensor is somewhere at the margin). After switching to the wall thermostat’s temperature sensor, the inconsistently measured temperatures went away. Now my home is always within a degree of where I want it to be.

It’s strange that Fujitsu’s air handler’s temperature sensor is the default even with a wired RCU (with sensor) connected. It’s even stranger that you must power cycle the entire system to use the wall thermostat’s sensor. I had actually tried the above settings long ago but without the power cycle. 

Other than the wrong sensor being used, this heat pump has been amazing and it’s even better now. It’s so much more efficient & safer than nature gas and it is ridiculously quiet.

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Today I finally photographed one of several Orange-crowned Warblers that use our backyard as a hunting ground #OrangeCrownedWarbler #Birds #Fujifilm #SOoCA small yellow-green bird, with a short but sharp beak, perched on a wooden fence cross beam near some green Ceanothus leaves.

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The resident Scrub Jay had herself a vigorous bath on this fine California day #WesternScrubJay #Fujifilm #SOoC #Birds A jay splashing in a metal birdbath with water droplets scattering around. The background is a wooden fence. A blue jay splashes in a birdbath, causing water droplets to spray around. A wooden fence serves as the background. A scrub jay splashes in a birdbath, sending droplets of water into the air against a wooden fence background. A scrub jay with fluffed feathers is perched on the edge of a birdbath, set against a wooden fence backdrop.

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I’m stoked that our asparagus bed, now in its third home over the last ten years, is beginning to produce enough to harvest. It’s been a long road with many years of our not caring but they persisted anyway and thus eventually regained our affection #Yarden #Gardening Young asparagus spears growing in a garden bed amidst scattered rocks, next to a wooden fence. Small green sprouts and a drip hose are visible in the background. Five stalks of fresh cut asparagus on a paper towel in a metal baking tray. They fade dark green to light purple at the bottom.

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For the A330-900 Neo by X-Plane aircraft developer Toliss, I wrote a FlyWithLua script that enables Yawman Arrow controller multifunction buttons. Special to the A330-900 Neo, the Yawman's POV center click toggles the HUD #XPlane #XPlane12 #FlightSim #FlyWithLua #YawmanArrowController

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My top 2024 albums per the Albums app. This is not a full dataset though as I used Tidal until they ended Plex integration & then I switched back to Apple Music but it’s reasonable! #2024TopAlbums @albumstheapp@indieapps.space A collage of album covers titled “Most Listened: 2024 Stats” showcases various albums. Featured artists include Daft Punk, The Black Keys, Coldplay, The Decemberists, Kasabian, Billie Eilish, Death Cab for Cut

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2024 was an off year for travel as I didn’t once make it to a major airport. I only stopped in Medford for an overnight stop and so spent a short time at the airport watching Coulson tankers and E-175s #2024Top4AviationScores #AvGeek #Aviation #FujifilmA large DC-10 firefighting aircraft labeled “10 TANKER” is landing on a runway, with an American flag visible in the background. A large three-engine DC-10 aircraft is taxiing on a runway with mountains and trees in the background. A fenced area with a “No Trespassing” sign is visible in the foreground. A Coulson C-130 firefighting aircraft in flight, featuring a bold red and black design with the number “138” on the tail.

An E175, reg N515SY, with American Eagle branding on a runway, with trees and distant hills in the background, viewed through a chain-link fence.

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If you fly X-Plane 12 with the Yawman Arrow Controller, check out my basic aircraft specific FlyWithLua scripts to enable multifunction button operations to limit reaching for your keyboard/mouse: https://www.distortions.net/yawman-arrow-controller-xplane/ #XPlane #XPlane12 #YawmanArrow #Flightsim

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Today: Downy Woodpecker skillfully foraging at the Pine Creek Unit of the refuge #DownyWoodpecker #SacramentoWildlifeRefuge #Fujifilm #SOoC A Downy woodpecker is perched upside down on a branch of a tree with sparse leaves.

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Snow sculptures from a very wintery Berlin in early December 2023 A snowman with three snowballs is displayed on a pedestal in front of a store. It has a stick for arms and a simple face. There’s a small signpost behind it, and a card rack is visible to the side. A store front is behind the snowman. A small snowman stands in the snow with stick arms, closed eyes made from twigs, and a leaf for a mouth. In the background, there is a large out of place rock formation. The surrounding area is snowy with trees in the distance.

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Last Sunday, we witnessed a Western Meadowlark in a meadow! 😲🫣 #WesternMeadowLark #SacramentoWildlifeRefuge #Birds #Fujifilm #SOoC A Western Meadow Lark stands in a field of tall, dewy grass. The bird has a distinctive yellow chest and mottled brown plumage, blending into the surroundings. Drops of water are visible on the grass. They’re looking toward the camera.

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Poor Great Horned Owls have no privacy in the winter #GreatHornedOwls #SacramentoWildlifeRefuge #Birds #Fujifilm #SOoC Two great horned owls sitting on a sturdy branch with lots obscuring bare tree limbs. They’re looking toward the camera.

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A soggy juvenile Bald Eagle at the Refuge today! #BaldEagle #Birds #SacramentoWildlifeRefuge #Fujifilm A juvenile Bald Eagle is perched on a bare tree branch against an overcast sky. It’s looking toward the camera. Its body feathers are mottled brown and white but it has a white head.

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Last Sunday: an American Kestrel. Just look at that face! 🤩 #AmericanKestrel #SacramentoWildlifeRefuge #Fujifilm #SOoC An American Kestrel, with narrow black eyeshadow, perched on the bare branches of a tree against a clear blue sky.

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Stereotypical Black-necked Stilts at the refuge yesterday #BlackNeckedStilts #SacramentoWildlifeRefuge #Birds #Fujifilm #SOoC #MondayIsForTheBirds A group of black-necked stilts standing in shallow water with tall grass in the background. The birds have long, thin legs and are reflected in the water.

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The Snow Geese cannot be missed right now at the Sacramento National Wildlife Refuge. Also not to be missed: widebodies on approach to SFO. In this case, a KLM 787-10 #SnowGeese #SacramentoWildlifeRefuge #Fujifilm #SOoC #Aviation #SFOA large flock of Snow Geese flying in the sky with some foliage blurred in the foreground. A distant KLM 787-10 flying across a clear blue sky, leaving a contrail behind.

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When my wireless network goes on the fritz, adding another WiFi node fixes it. Then I remove it a few days later and there’s no instability 🤷‍♂️ It’s like Ativan for my network

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Only 9am and already there’s an inch of rain for the day! Gotta pump the closed basin in our backyard again (it’s a couple meters from the house) #CaWx

A pump foot is attached to a garden hose. It’s submerged in a 1” deep puddle overlaying gravel. There seems to be rain drop waves in the puddle.
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Overnight rain total was 1.25”. That’s quite good for the Sacramento Valley! #CaWx

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Marsh Wren! #WrensDay #MarshWren #SacramentoWildlifeRefuge #Birds #Fujifilm #SOoC 🪶 A Marsh Wren is perched on a tall green reed, singing with its beak open. The background is a blurred natural setting with trees.