- This topic has 26 replies, 8 voices, and was last updated 12 years, 10 months ago by
.
-
Posts
-
Re: bosch lower spray arm
Johnnyboy wrote:Anyway I changed the heater box assembled all ok fitted the machine back into position switched it on and BANG, pcb blown s**t,,,,,,,,
Sorry to hear that but this is often the case I found myself personally. Generally nowadays I would write it off as heater and board are not marriage made in heaven so to speak. Like I said, nothing is so soul destroying to find that you gone at great length to replace the heater box only to find the board blown. on the upside, at least eh board blew up and you can get that fixed for about £40 as long the heater is not blown as well!
Re: bosch lower spray arm
That’s so annoying for you Johnnyboy, it can be a PITA taking these wash cabinets off.
In response to Martin’s query you just need to take the distributor disk out to allow both spray arms to rotate simultaneously.To do this you have to obviously take the heater unit out, (I’ve never had to cut off the locking tabs), unscrew the distributor motor and remove the centre pin holding in the disk. Put the centre pin back so it doesn’t leak and reassemble.
I’ve done this countless times and had no problem or recalls doing this, actually The first time I did this the customer phoned me in the evening asking him to give me a call, expecting the worst I rang him and he said thanks a lot it has never washed so well!
Obviously its best to replace the whole heater unit but doing this can get you out trouble, if the distributor is faulty because of the pcb, a new pcb and heater will most likely make the appliance BER.
Re: bosch lower spray arm
boselecta wrote:I’ve done this countless times and had no problem or recalls doing this, actually The first time I did this the customer phoned me in the evening asking him to give me a call, expecting the worst I rang him and he said thanks a lot it has never washed so well!
Hmmmmm? The thing is that the circulating pump impellor is a great deal smaller than those pumps without the diverter valve. Therefore cannot deliver sufficient force of water required for both spray arms to operate simultaneously. In essence it is only half as effective as the older, larger pump unit.
Also the force of water flowing through the heater unit is significantly reduced sufficient enough for the flow microswitch to keep switching the heater on and off as it struggles with the reduced pressure.
All in all I believe disabling the diverter valve nothing more than an out and out bodge pure and simple. 🙁
Re: bosch lower spray arm
On the later machines with the metal tray only the lower arm rotates, on all the tub out plastic base machines, both arms do operated simultaneously.
There is a way around this problem with the metal tray machines but best I leave that as don’t want people to start calling me a cowboy!.
Re: bosch lower spray arm
boselecta wrote:On the later machines with the metal tray only the lower arm rotates, on all the tub out plastic base machines, both arms do operated simultaneously.
Totally incorrect on both counts I’m afraid.
Re: bosch lower spray arm
You do not have to be brave and if you tell the customer what you are going to do i dont see a problem. I have changed heater boxes before
but if the customer does not want to spend much on the machine it can save another machine from the scrap,
All you get is water going to top & bottom arms at the same time.Re: bosch lower spray arm
roy1 wrote:All you get is water going to top & bottom arms at the same time.
True but as Martin pointed out…
Martin wrote:
Hmmmmm? The thing is that the circulating pump impellor is a great deal smaller than those pumps without the diverter valve. Therefore cannot deliver sufficient force of water required for both spray arms to operate simultaneously. In essence it is only half as effective as the older, larger pump unit.Also the force of water flowing through the heater unit is significantly reduced sufficient enough for the flow microswitch to keep switching the heater on and off as it struggles with the reduced pressure.
All in all I believe disabling the diverter valve nothing more than an out and out bodge pure and simple. 🙁
In this case I generally agree with him, if you think about it… Bosch is on a major drive to reduce energy and water consumption, they achieved this by reducing the amount of water used and reducing the water pressure of the motor which was traded off by putting in a diverter motor to create stronger pressure alternating. They did that without compromising the washing performance.
Ask yourself why do heater boxes are so cheap? £30 from Connect the last time I checked. This was the same box that used to cost £100 last year and now it dropped right down and this is genuine Bosch part. Is it worth taking the risk by removing the diverter? I am a strong believer that manufacturer made the product that it was designed to do and the parts used fits for what it was designed to do. Some are of a questionable quality but on the whole if Bosch uses the diverter then it is reasonable to expect that the machine should be respected by fitting brand new heater box with diverter built in then you have a fully functional machine that it was designed for as all components in it compliments each other.
Having said that based on my experiences they tend to blow the board out (before or after) and it may not be obvious to start with, after fitting new heater then the board blew out then you send it away for repair providing the heater box is still intact then refit the board. After all you are simply making the customer wait a little longer (if they can cope but I found half of them says “forget it”) and I think they will respect you (the other half who would agree to it) for that as you are saving their dishwasher by doing a proper job. The reason why some people says “forget it”, they do not want to live any longer without a broken dishwasher and are often persuaded by the knowledge that they can get new dishwasher for £200 these days. You do not need to tell them the price of new dishwashers as they already knew about it.
Re: bosch lower spray arm
Martin wrote:
boselecta wrote:
On the later machines with the metal tray only the lower arm rotates, on all the tub out plastic base machines, both arms do operated simultaneously.Totally incorrect on both counts I’m afraid.
Totally correct on both counts I’m afraid.
Done it and demonstrated it working to happy customers.Re: bosch lower spray arm
So am I correct in thinking that it is not unusual for a board to blow when a new heater is fitted?
Re: bosch lower spray arm
Johnnyboy wrote:So am I correct in thinking that it is not unusual for a board to blow when a new heater is fitted?
Based on my experiences these tend to happen either way. Sometime you are lucky depend on what’s wrong with it. I found it is more hassle than it worth. Thankfully, the majority of the heater failures are often older Bosch/Neff/Siemens dishwasher that are around 8 years old so customers tend to write it off.
Like yourself, I do find myself wondering if I could have picked it up or avoided it. I would love to know how to unless someone out there can offer better way of diagnosing the faults? I hate seeing Bosch dishwashers being scrapped as they are very good and they do go the extra mile unlike other makes.
Re: bosch lower spray arm
Johnnyboy wrote:So am I correct in thinking that it is not unusual for a board to blow when a new heater is fitted?
I’ve fitted hundreds of Instantenious water heaters and never had a PCB “blow” afterwards as a result. Why the hell would they anyway? Unless you go about heater changes by turning the darn dishwasher upside down I suppose. Or a cock-up refitting the wiring maybe?
An element that fails by going open circuit would never compromise the PCB. However if the heater unit needs replacing because the diverter unit within has failed then it is essential to check the PCB first before fitting one. Water point diverter motors are notorious for taking out the PCB so any complaint of spray arms not rotating then checking the PCB is a must.
- You must be logged in to reply to this topic.