F4 fault with Vizo Plus 24. Not condensation tube as this was changed to new tube with sensors on ''blue plug'' by engineer last year when I called them out for re-curring F4 fault - new sensors are bone dry. Have re-set boiler and it tries to fire up four times before displaying fault, but appears to be no ignition clicking, and therefore no flame. Gas supply is good.

The F4 error code and 5 LED lights on a Hotpoint condenser tumble dryer typically indicate a problem with the moisture sensor or the condenser unit. The moisture sensor is responsible for detecting the amount of moisture in the drum and the condenser unit is responsible for removing the moisture from the air.
To troubleshoot this problem, you can try the following:

1. Clean the condenser unit: remove any lint or debris that may have accumulated in the condenser unit. Make sure the condenser unit is clean and free of blockages.
2. Check the moisture sensor: the sensor may be clogged or not working properly. Clean the sensor and make sure it is connected securely.
3. Check the air flow: make sure that the air flow to the condenser unit is not blocked.
4. Check the drain hose: make sure the drain hose is not clogged or kinked, and that the water is draining properly.
5. Check the water container: make sure the water container is empty and not overfull.
6. If the problem persists, it is recommended to consult a professional technician to check the dryer or contact the Hotpoint customer service for assistance.

It is important to note that these instructions may vary depending on the dryer model, so it is best to consult the user manual for specific instructions.

Unsure if your model has a front housing to be checked.

http://www.appliancehelponline.com/asko.html

Asko

Dryer Failure Code Condition Check/Repair F1 Condensate drain overfilling Check condensate reservoir pump and drain tube. F2 Maximum drying time exceeded (3hrs) - Check for tripped circuit breaker or blown fuse
- Check ductwork for lint build-up
- Check hi-limit and cycling thermostat
- Check heating element F3 Thermistor fault - Open thermistor, replace
- Bad wiring to thermistor F4 Too much lint in the lint filter, front housing, or in the condenser Clean lint from lint filter and/or condenser F5 Fault in the moisture sensor - Lint covering sensor in front of housing
- Bad sensor
- Bad wiring to sensor

f4 mean Air Conditioners Questions & Answers - Fixya

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My gree split type ac error F4 what is problem Name of malfunction = Outdoor tube sensor open or short circuit Display of double eight code = F4 this means

Here is the list for the DRYER not sure what model... guys please post MODELS!!!!!!!!!!!!!!!!!!!!!

Asko
Dryer

Failure Code Condition Check/Repair

F1 Condensate drain overfilling.
1. Check condensate reservoir pump and drain tube.

F2 Maximum drying time exceeded (3hrs) 1. Check for tripped circuit breaker or blown fuse
2. Check ductwork for lint build-up
3. Check hi-limit and cycling thermostat
4. Check heating element

F3 Thermistor fault 1. Open thermistor, replace
2. Bad wiring to thermistor

F4 Too much lint in the lint filter, front housing, or in the condenser.1. Clean lint from lint filter and/or condenser

F5 Fault in the moisture sensor · Lint covering sensor in front of housing1. Bad sensor
2. Bad wiring to sensor

This sounds like the idle control valve or stepper motor as it's sometimes called needing a good clean out or replacement. When faulty this would cause all the symptoms you are describing.

There is a pressure adjustment on the gas valve...make sure you set it with a manometer. If the water is just condensate, its ok except if you don't have enough combustion air for the btu rating of the water heater. If it is a leak, replace the water heater

Hello
The engine and automatic transmission in this vehicles drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM
One last comment, defective Oxygen sensors will not cause a loss of power, NEVER, they are just reading a symptom of the problem, they are not the problem, 35 years of experience tells me that.

When was last fuel filter change? For that matter when was last tune up? Seriously, sounds like fuel filter, especially this time of year. With big temperature swings condensation (water) forms in fuel tank. Run a bottle of STP gas treatment through it then change fuel filter.

GE
Microwave Fault Codes Failure
Code Condition Check/Repair F1 Open sensor, will occur below 190F of cavity temperature within 15 minutes after starting convection, combination or roast cook Check oven temperature sensor for continuity. Replace if zero or infinite ohms F2 Shorted thermal sensor, will occur if a shorted thermal sensor is detected continuously over 5 seconds on convection, combination or roast cooking Check oven temperature sensor for continuity. Replace if zero or infinite ohms

Note: It will take a minimum of 5 minutes of convection run time before F1 or F2 code will be displayed if the thermal sensor is shorted or open. F3 Shorted key panel (touch pad), will occur if a shorted key panel is detected continuously over 60 seconds Replace key panel (touch pad) F4 Open humidity sensor, will occur if humidity sensor is detected as being open continuously over 5 seconds Replace humidity sensor F5 Shorted humidity sensor, will occur if humidity sensor is detected as being shorted continuously over 5 seconds Replace humidity sensor F6 Shorted temperature probe, will occur if temperature probe is detected as shorted continuously over 5 seconds Replace temperature probe ProbEe Open temperature probe, will occur if temperature probe is detected open, or not plugged into the receptacle If probe is plugged in and "ProbE" is on display check continuity of the probe with an ohm meter. If zero or infinite ohms, replace it

John , these models use a self-resetting, disc type thermal cut out in the sensor circuit. The normally open disc is wired in parallel with the sensor. When tripped, the thermal cut out shorts the sensor circuit resulting in an F4 failure code. Since you are reading the proper ohms in the sensor I believe you are ok there. They do have a kit WB24K5048 to correct this problem. The kit contains a higher rated thermal cut out, an insulation barrier and instructions. Catriver...post back.