Hello,

 

I have a Mitsubishi WP-305QS.

 

A few days ago the water pressure in the house dropped.

 

The pump was starting at 2.0 bar and shutting off at 2.4

 

In the past it was starting at 2.4 and shutting off at 2.8 which correlate with the data page.

 

The readings were taken from the pressure gauge on the filter.

 

I cleaned the filter, checked/cleared all lines, etc with no improvement in pressure.

 

Best guess the pump is 8 years old and appears to be in good order.

 

Any ideas what the problem might be?

 

Can I simply adjust the high/low pressure back to 2.4/2.8 and if yes, how?

 

Any help is much appreciated.

 

Kidd

　

　

　

Hello,
 
I have a Mitsubishi WP-305QS.
 
A few days ago the water pressure in the house dropped.
 
The pump was starting at 2.0 bar and shutting off at 2.4
 
In the past it was starting at 2.4 and shutting off at 2.8 which correlate with the data page.
 
The readings were taken from the pressure gauge on the filter.
 
I cleaned the filter, checked/cleared all lines, etc with no improvement in pressure.
 
Best guess the pump is 8 years old and appears to be in good order.
 
Any ideas what the problem might be?
 
Can I simply adjust the high/low pressure back to 2.4/2.8 and if yes, how?
 
Any help is much appreciated.
 
Kidd
　
　
　

If you put your gauge on a tap and turn it half on, then you will see what the start and stop pressure is. I don't quite understand about your reading on the filter.

If you then look at the pump website Im5sure you will find out how to adjust the pump on/off pressure.
IMOPRTANT
Make sure you use an insulated screwdriver as the adjustment screw is live power.



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16 hours ago, carlyai said:

IMOPRTANT
Make sure you use an insulated screwdriver as the adjustment screw is live power.

Indeed - and this is possible even when power is turned off the way they are often wired here.  Highly advise paying worker who knows what he is doing to do this as the control does not want to be changed (locked in place) and just not worth taking a chance on your life.  It may require a replacement unit in any case.

Okay thanks lopburi3, good info. Much appreciated.

Here's the IPL for you r pump.  The switch is item 44 and if you PM me I will send you the info on where you can buy it direct from the distributor in Bangkok, pay via bank transfer and have it sent via EMS.  They are available locally but be careful as there are different size fittings on different model tanks so be sure that you get the correct one. WP-255Q3 IPL.pdf