Mitsubishi pump on the blink

[proton]

Its 150 wat WP 155, 11 years old, had to replace leaking tank last year, After that it started pulsing and never did find a solution. Now its not kicking in properly for the water downstairs, but upstairs it's still OK which seems odd. Tried bleeding the tank and altering the pressure switch screw but no change. Cannot understand why it works for upstairs but stopped on the ground floor, just a trickle from taps there.

[carlyai]

Stop the water flow upstairs and check again. (Turn the valve off feeding upstairs.) 

 

[proton]

1 hour ago, carlyai said:

Stop the water flow upstairs and check again. (Turn the valve off feeding upstairs.) 

 

There is not a valve to cut upstairs off, probably buy a new pump

[Will B Good]

The pressure valve?

 

That would explain why upstairs is okay....greater back pressure.

 

Take the cover off the pressure valve, using an OO hammer give it a good few taps....spray with ant killer and then lightly oil.

 

Good luck.

[carlyai]

4 hours ago, proton said:

There is not a valve to cut upstairs off, probably buy a new pump

OK  buying a new pump is probably the answer, but you need to make sure it is the pump first. 

I'd do what Will B Good suggests (I still can't see why you'de have bad pressure downstairs but not upstairs). Sounds to me like a blockage, but I don't know your setup.

I'd make sure I had good flow into the pump and out of the pump before thinking of buying a new pump.

You can buy a pressure guage and screw on one of your take on the pump outlet to see what the pressure varies between.

I'll go outside and take a pic of mine.

[carlyai]

Pics of my pressure guage and pump.

If you find the pressure is down, you can always buy a new impellar....not too expensive, as you've already bought a new tank.

[lopburi3]

Is pump full time or just activated when city water pressure low?  Is pump actually starting when downstairs tap is opened?  Did you have someone do the tank change (can be problematic)?  If you have made pressure adjustments likely best to have a tech take a look (any shop that sells pumps can recommend someone) - pumps/water can be very frustrating so well worth the cost.  Be very careful as adjustments can expose hot wire (even when turned off - not always the hot line they hook up to switch).

Edited January 3 by lopburi3

[proton]

34 minutes ago, carlyai said:

Pics of my pressure guage and pump.

If you find the pressure is down, you can always buy a new impellar....not too expensive, as you've already bought a new tank.

 

Never seen them fitted with those gauges, whats a impellar?

[proton]

9 minutes ago, lopburi3 said:

Is pump full time or just activated when city water pressure low?  Is pump actually starting when downstairs tap is opened?  Did you have someone do the tank change (can be problematic)?  If you have made pressure adjustments likely best to have a tech take a look (any shop that sells pumps can recommend someone) - pumps/water can be very frustrating so well worth the cost.  Be very careful as adjustments can expose hot wire (even when turned off - not always the hot line they hook up to switch).

 

Pump starts once for downstairs, but not long enough, mrs got a real expert to fit the tank- a van driver!

[Crossy]

49 minutes ago, proton said:

whats a impellar?

 

The whizzy going round bit that actually pumps the water

 

It lives inside the cover with the pipes on the end of the motor.

 

"impeller" really

[carlyai]

2 hours ago, Crossy said:

 

The whizzy going round bit that actually pumps the water

 

It lives inside the cover with the pipes on the end of the motor.

 

"impeller" really

Australians can't spell. :)

[UWEB]

Buy a new Pump, it's just 5.500 THB. Not the trouble worth to repair such an old Pump.

[UWEB]

10 hours ago, proton said:

Its 150 wat WP 155, 11 years old, had to replace leaking tank last year, After that it started pulsing and never did find a solution. Now its not kicking in properly for the water downstairs, but upstairs it's still OK which seems odd. Tried bleeding the tank and altering the pressure switch screw but no change. Cannot understand why it works for upstairs but stopped on the ground floor, just a trickle from taps there.

Have you ever cleaned the small sieve in your Water Tabs and Shower Heads?

[proton]

1 hour ago, UWEB said:

Have you ever cleaned the small sieve in your Water Tabs and Shower Heads?

 

Yes, but thats upstairs where it works

[Moonlover]

14 hours ago, UWEB said:

Have you ever cleaned the small sieve in your Water Tabs and Shower Heads?

Good suggestion. If the pump is working and delivering water upstairs, that suggests there's nothing wrong with the pump. You need to concentrate your efforts on seeking out was seems to be a blockage in the downstairs plumbing.

[lopburi3]

On 1/3/2024 at 11:12 AM, Will B Good said:

The pressure valve?

 

That would explain why upstairs is okay....greater back pressure.

 

Take the cover off the pressure valve, using an OO hammer give it a good few taps....spray with ant killer and then lightly oil.

 

Good luck.

Actually if built like my old 405 model the pressure sensor was a separate hole in water tank that had to be installed - if van driver did the tank replacement and pressure never worked right perhaps it was not even installed on the new tank?

[bluejets]

23 hours ago, carlyai said:

Australians can't spell. :)

Open a new discussion, I'll bet you get a gazillion replies and just as many variations on spelling.