Thread: problem with water pump?

we got a new yellow mitsubishi one 6 months ago. Worked ok but now it does not come on long enough and the pressure is down, the flow is pulsed as it only comes on for less than a second at a time, then off then on again. Is there any way to get it fixed without disconnecting it and carting it back to the shop? As usual the mrs who looks after such things has lost the paperwork that came with it so I don't know if there is any sort of re set or anything you can do yourself

Bleed the air out of it.

and change the pressure switch too

how to do? do you take the top off it and need a key like with a radiotor to bleed the air? Thanks for the tips

Check the suction filter to see if its plugged?

Open the discharge side of the pump to check if the internals are plugged.

If it was working properly what has changed in your system? Did you loose pressure?

Did the water level go below suction level? Causes "Cavitation." Serious damage to pump.

Re-prime the pump at the plug on top and see if this induces proper suction?

Do what commentator's 2 AND 3 SAID.

Originally Posted by xanax

how to do? do you take the top off it and need a key like with a radiotor to bleed the air? Thanks for the tips

There should be a plug on top? Unscrew it and pour water into it till full. Keep a beaker of water or better a hose nearby running (but not in this case as you have no flow situation to begin with) to keep the priming point full till the pump takes suction on restart. Restart the pump and open a faucet nearby to see if water pressure in present and flowing.

Make sure your water source is full as well before starting up.

Do you have your own tank or take water directly from city supply?

direct from supply, no screw on top just flat, will take top off later when the washings done and have a look under

When its direct from supply, you may be running the pump when there's no water supply from source.

Bad situation. You should get a reservoir/tank for water storage to insure you don't run the pump on a dry suction.

Be sure to check the solenoid as previously mentioned. It may be damaged causing the intermittent supply/ in and out on/off of the pump.

How are you using the pump now?

Try this first in case it just needs bleeding:

1. Switch pump off
2. Close valve on inlet water supply
3. Open a downstream valve (or a tap in the house) to bleed off pressure
4. Look for a plug on the pressure tank. Take it out.
5. Drain the water out and replace the plug
5. Open up the water supply
6. Switch on the pump and see if it acts normally

job for this afternoon, I told the mrs we should get a tank but 'waste of money' was the answer! many thanks.

In my opinion a pump without a tank is a complete waste of money, a tank here is essential.

Originally Posted by xanax

job for this afternoon, I told the mrs we should get a tank but 'waste of money' was the answer! many thanks.

Read through Dr. Andys apartment build threads. He addresses the need for a storage tank quite well there. He's on Chiang Mai's city water supply.

All city water supplies are "Unreliable." Not news but just had to say it. I have two water storage tanks in case we have an extended shutdown of the water supply. Sometimes it lasts for 3 or more days.

I like showers and flushing toilets. Get the holding tank and it should solve/resolve some of your problems.

Originally Posted by xanax

job for this afternoon, I told the mrs we should get a tank but 'waste of money' was the answer! many thanks.

I was referring to the pressure tank that the pump is connected to (usually right underneath the pump on the cylindrical units), not a storage tank.

where are the pressure switches and plug? I switched off the supply and turned on a tap, then loosened the round screw top left, thought that might be letting the air out but just water came out so I stopped

We have the same model, provided by the drilllers.

Problems started day one

They promised us money back and have since dissapeared

Basicly they don't know what they are doing

I have the same or similar pump shown in the pic. It's really is a crap pump. After a month I changed it for another better pump. Been happy ever since.

You really do need a supply tank.
Your demand for water can easily outstrip mains water supply. And that is what probably/likely is the problem.

As per the above poster, grow a set and get yourself a tank.

Two things:

- You MUST have a supply tank on the input, else the pump will suck in foul water when the mains pressure drops. This is very dangerous to your families health.

- A true pressure pump has a large pressure cylinder which smooths out the pressure fluctuations. Lately cheap pumps have appeared which don't have a pressure tank at all. These are not Pressure Pumps, they are just intended as auto-start pumps for washing down pig-styes, etc. These cheap pumps make very poor pressure pumps, they cycle rapidly and soon burn out the switch contacts.

I thought mitsubishi were meant to be the best ones, looks like a tank next then.

Originally Posted by The Big Fella

Without a tank you are wasting your time and money. for the sake of a couple of thousand Baht you can get a two thousand litre tank that the government supply trickle fills and then your pump supplies your house from the tank. In the event of not having Government water for any reason you should still have a tank full to keep you going till it returns.

Not sure where you got yours, but as I recall, our 2,000 l hand-grenade looking tank cost us about 15,000 baht (HomePro). And that was just 2-3 months ago.

Hopefully, they will install it, soon, around the back.



Steve

It is not a water tank in you picketer Steve , the is a tank for wc

1000 l I paid 3600bat for 2 months

Originally Posted by mfosh

It is not a water tank in you picketer Steve , the is a tank for wc

You mean it a shit tank that gets berried in the ground.

This is a large water tank

Originally Posted by xanax

where are the pressure switches and plug? I switched off the supply and turned on a tap, then loosened the round screw top left, thought that might be letting the air out but just water came out so I stopped

The pressure tank is the yellow part that the pump is sitting on. The drain plug will be on the side of that down near ground level.