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About a month ago, the machine stopped just before the first spin cycle with a Pump Blocked? message. I went through all the standard procedures for clearing a blocked pump, but did not find any obstructions. The pump was running quite a bit louder than normal, so I decided to replace it.
The new pump is in and working very well, nice and quiet, pumping out water wonderfully. However, the machine still does not clear the first drain cycle. I’m still getting the Pump Blocked? message.
I have since completely removed all of the drain plumbing, thoroughly cleaned and inspected everything — sump ball, pressure chamber, drain tube, trap chamber and the vent tube between the trap chamber and the drum. Everything is completely clean and clear. And I’m still getting the Pump Blocked? message at the first drain cycle.
How does it know the pump is blocked? What sensor tells it the water is drained? Perhaps that sensor is bad.
I’ve seen other messages in this forum about people forcing the next cycle. Is that possible on a WFR2460?
Is there a diagnostic mode or test mode I can put the machine into to get more information?
Thanks in advance for any help!!
Re: Bosch WFR2460UC/01 FD 8305 021179 — Pump Blocked?
The computer will allow a fixed period of time to detect a drop in the water level. Your machine has two pressure operated switches in the top. One is a diaphragm switch, which simply makes and breaks it’s contact with the air pressure. The other is a proportional device, using a moving armature within a coil to generate a “proportional” signal which the computer will interpret for very exact water level control.
If the machine is actually draining, the problem will lie with the level switches and their function.
Power off if investigating.
Penguin45.
Re: Bosch WFR2460UC/01 FD 8305 021179 — Pump Blocked?
Penguin45 wrote:If the machine is actually draining, the problem will lie with the level switches and their function.
Yes, the machine is draining. I replaced the digital pressure switch, hoping it was the problem, but apparently, it was not. Before I replace the analog pressure switch (more expensive) I wanted to see if someone had some testing procedures so I could know for sure if it’s actually defective.
When I put a voltage meter on it before and after the machine fills, it does produce different voltages. I just don’t know what the expected voltages are at the different water levels so I don’t know if the voltages I’m measuring are within specs.
Re: Bosch WFR2460UC/01 FD 8305 021179 — Pump Blocked?
Here are the voltages I’m measuring. Pins are numbered 1 through 3 from bottom to top as the switch is mounted.
Switch machine to Regular/Cotton Cold setting, before pressing Start:
Pins 1-2 .8 volts
Pins 1-3 10.4 volts
Pins 2-3 9 voltsStarted machine. Observed voltage between pins 1-2 increase steadily to 2.1 volts as the machine filled. Pins 1-3 stayed at 10.4 volts. Pins 2-3 decreased to 7.8 volts.
Paused machine. Switched to Drain cycle and pressed start. Observed voltage between pins 1-2 decrease steadily as the machine drained. Bottomed out at .6 volts when pump impeller started cavitating (drum drained.) Pins 2-3 peaked at 9.2 volts. Pump continued for a few minutes until the Pump Blocked? message was displayed.
Re: Bosch WFR2460UC/01 FD 8305 021179 — Pump Blocked?
I would have changed the mechanical switch rather than the analogue one TBH.
More likely sticky contacts in that unit IMO.
P/no 427041 if required from your stockist. 😀Greg
Re: Bosch WFR2460UC/01 FD 8305 021179 — Pump Blocked?
gegsy wrote:I would have changed the mechanical switch rather than the analogue one TBH.
More likely sticky contacts in that unit IMO.
P/no 427041 if required from your stockist. 😀Greg
Yes. That is the one I changed — the main pressure switch. Because that one was cheaper. 😉
The mechanical switch is the digital switch. The electronic switch is the analogue switch. It sounds backwards unless you look at them the way the computer does. The mechanical switch is either on or off (digital). The electronic switch varies the voltage (analogue) based on water level.
I’m American. I’m also a computer professional. That either explains my reasoning or my idiocy. Take your pick. 😛
Re: Bosch WFR2460UC/01 FD 8305 021179 — Pump Blocked?
Well you seem to have elimnated as much as you can.
Its looking more like a poor connection/s from these units or the module itself faulty, if I am honest 😕Greg
PS – I will take you at reasoning 😉
Re: Bosch WFR2460UC/01 FD 8305 021179 — Pump Blocked?
gegsy wrote:Well you seem to have elimnated as much as you can.
Its looking more like a poor connection/s from these units or the module itself faulty, if I am honest 😕Greg
PS – I will take you at reasoning 😉
Thanks! Anyone know if there’s some way I can put the controller board into test or diagnostic mode and have it tell me if the signals from the pressure switch are making it all the way through?
Re: Bosch WFR2460UC/01 FD 8305 021179 — Pump Blocked?
OK, I figured out how to get the machine into test mode. The first thing in displays is:
START > MENU > T1: ERRORS
LA Er: 15Anyone have a clue?
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