Just 3 weeks ago we bought a new pump as our old Hitachi was rusting away, the pump we have now is a Mitsubishi WP-105QS and it's driving us MAD!!!!!

It is constantly cutting and pumping, just like this youtube video https://www.youtube.com/watch?v=BWB0UAaJOyc

Some of my neighbours have said they'd never buy mitsu again due to similar problems, I'm tempted to just go and buy an Hitachi like we had before, any ideas what's wrong with it? Why would it <deleted> up so soon after buying it??

Pulling my hair out

That's interesting, do you think I could get one of them in just a regular hardware shop here?

Thanks! I'll go and see if they have one now

Do you have a positive supply to the pump from a tank or are you getting the water from a well or a tank lower than the pump?

There is a built in check valve on the pump suction. Some pumps come with 2 different springs to install there. Others have one but tell you to remove the spring that is installed if you are lifting the water.

Do you have a positive supply to the pump from a tank or are you getting the water from a well or a tank lower than the pump?

There is a built in check valve on the pump suction. Some pumps come with 2 different springs to install there. Others have one but tell you to remove the spring that is installed if you are lifting the water.

I have been searching everywhere (in the house) for the manual of that pump but I can't find it anywhere.

UJ, can you explain then why putting in a check-valve (in between the holding tank and the pump) solved my problem.

Probably because the check valve on the pump was bad or missing.

- if your water supply tank is on the same level as your pump, you have probably some air entrapped in your supply pipe. Just vent it through the vent screw.

YouTube configuration from OP is lower than your pump, means more difficult to vent. In that case you also have to pay attention to the limited TOTAL suction head of your pump : which is max. 9m.

http://mitsubishielectricmalaysia.com/products/water-pump/q3/water-pump-specs.jpg

The Mitsu pump problem was also discussed on a previous TV thread :

http://www.thaivisa.com/forum/topic/374519-problem-with-mitsubishi-water-pump/

http://www.pumpfundamentals.com/what%20is%20head.htm

All sorted, thanks! I was having a mild nervous breakdown this morning!!

just for reference - I don't have a tank, I just take my water straight from the meter out the front.

I remember when me and my neighbour installed the pump, my neighbour twisted one of the caps off the top, I saw a spring in there, I understand he was checking to see if the water was circulating, properly, am I correct in thinking that if I had simply removed this spring that I needn't have bothered farting around re-piping and attaching the check valve??...

Anyhow, as I said, it's all sorted now, I was on the verge of storming over to HomePro to splurge some unnecessary)& much needed) funds on an Hitachi in pure anger and frustration!

just for reference - I don't have a tank, I just take my water straight from the meter out the front.

Umm...

just for reference - I don't have a tank, I just take my water straight from the meter out the front.

Umm...

indeed Ummmmm,

Not allowed, dangerous, not advisable. Wondering who told you to do so?

I second that, although TIT and probably half of Thailand do it - still doesn't make it right.

just for reference - I don't have a tank, I just take my water straight from the meter out the front.

Umm...

indeed Ummmmm,

Not allowed, dangerous, not advisable. Wondering who told you to do so?

I second that, although TIT and probably half of Thailand do it - still doesn't make it right.

Exactly, probably the OP lives in a house with no space to put in a large holding tank.

Question, A problem with that ("sucking" straight from the mains) is that if the mains runs dry, the pump would keep pumping the water meter would keep spinning, and thus the he would have to pay for Air. Correct ?

The density from air is much lower then from water. Probably it will move, but not spin.

Imagine your neighbour is trying to solve a blocked sewage pipe with a garden hose. And you have a shower, direct after you flushed your toilet. Big change you take a shower with the contents from his sewage pipe. But if you think TIT you are free to do so!

Arjen.

Thanks, no problem here with that as (where I live) the houses have their own sewer systems (round concrete rings dug into the ground) so no connected systems. But understand what you are trying to say.

Ok filling the washing machine with a hose. Many reasons not to do this....

But for me it is easy, we have our own well and our own water tower.

Same here own well (40 meters) but pumped into an underground water tank (1200 liters) for the house and 1 (2000 liter) Tank to supply to supply the garden (separate pumps)

Edit: Also have (village) mains, but that water is ...... Dirty and ...... smells

Crossy usually likes the mental picture of someone leaving a running hose topping off their gunky fishpond ...then the village experiences a pressure drop and you get to enjoy fresh Nam Pla as your 'assist pump' continues to draws water from whatever line doesn't have a backflow attachment. Yum.

Crossy usually likes the mental picture of someone leaving a running hose topping off their gunky fishpond ...then the village experiences a pressure drop and you get to enjoy fresh Nam Pla as your 'assist pump' continues to draws water from whatever line doesn't have a backflow attachment. Yum.

Yes that is one of the problems of pumping off the main, one other is if the water main goes under vacuum because you are pumping from it and the main has a leak you can entrain contaminated ground water or sewage / effluent which has found its way to the area of the water main.......

That's interesting, do you think I could get one of them in just a regular hardware shop here?

Thai Watsadu has a big sized collection. The spring loaded ones are the only ones to buy.

Maybe your neigjbours (can be far away) use direct connected waterpumps, and are thus reducing the quality from the mains water supply

Could be but I suspect is that they don't do anything to clean it, no chlorine, no filters but just direct pumping from the lake into the water supply.

When I used mains water I had to change the water filters every +/- 3 days. And yes I had my well water tested and it was oke and strangely enough (for here) not salty.

The swing type check valve would work too if it is installed in a horizontal pipe with the cap on the top. The spring type is much easier can be installed in any orientation.

I find the Hitachi to be far more dependable. Have had nothing but problems with mistu pumps.

I find the Hitachi to be far more dependable. Have had nothing but problems with mistu pumps.

And no doubt someone will say the same about that they like Mitsu pumps better in a thread about Hitachi pumps

I find the Hitachi to be far more dependable. Have had nothing but problems with mistu pumps.

And no doubt someone will say the same about that they like Mitsu pumps better in a thread about Hitachi pumps

What an unhelpful comment. What was the purpose of that comment? Just for the sake of debate? I was stating a fact, based on my experience, that some might find helpful. Yours is pure conjecture.

I find the Hitachi to be far more dependable. Have had nothing but problems with mistu pumps.

And no doubt someone will say the same about that they like Mitsu pumps better in a thread about Hitachi pumps

What an unhelpful comment. Do you really have that much idle time on your hands? What was the purpose of that comment? Just for the sake of debate? I was stating a fact, based on my experience, that some might find helpful. Yours is pure conjecture.

Thanks. The OP is happy with his pump and just by saying hitachi is better is also IMO unhelpful.

Edit and about the idle time I am following this thread as my solution with the checkvalve solved the problem for the OP and just looking at the follow up.

We are here to help or not ???

I find the Hitachi to be far more dependable. Have had nothing but problems with mistu pumps.

And no doubt someone will say the same about that they like Mitsu pumps better in a thread about Hitachi pumps

What an unhelpful comment. Do you really have that much idle time on your hands? What was the purpose of that comment? Just for the sake of debate? I was stating a fact, based on my experience, that some might find helpful. Yours is pure conjecture.

I feel with MJCM. Nothing wrong with his statement. All these 'experiences' are subjective. So is yours. I prefer Danfoss pumps. And this also based on my experience. And also very subjective.

I would always select Grundfos above any other brand if there was a choice, this is based in 40+ years in the pump industry - not sure if this is subjective or experience.

I find the Hitachi to be far more dependable. Have had nothing but problems with mistu pumps.

And no doubt someone will say the same about that they like Mitsu pumps better in a thread about Hitachi pumps

What an unhelpful comment. Do you really have that much idle time on your hands? What was the purpose of that comment? Just for the sake of debate? I was stating a fact, based on my experience, that some might find helpful. Yours is pure conjecture.

I feel with MJCM. Nothing wrong with his statement. All these 'experiences' are subjective. So is yours. I prefer Danfoss pumps. And this also based on my experience. And also very subjective.

I would always select Grundfos above any other brand if there was a choice, this is based in 40+ years in the pump industry - not sure if this is subjective or experience.

I mentioned to say to Grundfoss, when I discovered my mistake it was not possible to edit anymore....

I should say unsubjective experience. For sure not scientific proven. But there is more then only reliability. Easy to repair, or maybe not to repair at all, availability from spare parts, does the supplier reply to (English) emails?

But be carefull, spidermike007 will not like this!!

Arjen

Danfoss is certainly up there with the best in their field of application.

I find the Hitachi to be far more dependable. Have had nothing but problems with mistu pumps.

And no doubt someone will say the same about that they like Mitsu pumps better in a thread about Hitachi pumps

What an unhelpful comment. Do you really have that much idle time on your hands? What was the purpose of that comment? Just for the sake of debate? I was stating a fact, based on my experience, that some might find helpful. Yours is pure conjecture.

I feel with MJCM. Nothing wrong with his statement. All these 'experiences' are subjective. So is yours. I prefer Danfoss pumps. And this also based on my experience. And also very subjective.

I would always select Grundfos above any other brand if there was a choice, this is based in 40+ years in the pump industry - not sure if this is subjective or experience.

I mentioned to say to Grundfoss, when I discovered my mistake it was not possible to edit anymore....

I should say unsubjective experience. For sure not scientific proven. But there is more then only reliability. Easy to repair, or maybe not to repair at all, availability from spare parts, does the supplier reply to (English) emails?

But be carefull, spidermike007 will not like this!!

Arjen

I've been criticised by many "experts" over the years on pump selection and application- I just take it in my stride now-a-days, so no problem

I find the Hitachi to be far more dependable. Have had nothing but problems with mistu pumps.

And no doubt someone will say the same about that they like Mitsu pumps better in a thread about Hitachi pumps

What an unhelpful comment. Do you really have that much idle time on your hands? What was the purpose of that comment? Just for the sake of debate? I was stating a fact, based on my experience, that some might find helpful. Yours is pure conjecture.

I feel with MJCM. Nothing wrong with his statement. All these 'experiences' are subjective. So is yours. I prefer Danfoss pumps. And this also based on my experience. And also very subjective.

I would always select Grundfos above any other brand if there was a choice, this is based in 40+ years in the pump industry - not sure if this is subjective or experience.

I mentioned to say to Grundfoss, when I discovered my mistake it was not possible to edit anymore....

I should say unsubjective experience. For sure not scientific proven. But there is more then only reliability. Easy to repair, or maybe not to repair at all, availability from spare parts, does the supplier reply to (English) emails?

But be carefull, spidermike007 will not like this!!

Arjen

Actually, I love it. Advice is always gratefully accepted, and I will take all of your advice to heart. I was only stating that I have had good success with Hitachi pumps. Samsung and Mitsu AC's. Sony and LG TV's. Pioneer DVD players. Honda Scooters. Marantz receivers. PSB speakers. Apple computers. Samsung smartphones. OWC hard drives. It is all subjective.

I, like all of my neighbours in a moo baan of about 100 houses use exactly the same method, I see it all over the land.

Am I missing something??

And yes, the pump's fine now, I followed up shortly after I fixed the problem

I, like all of my neighbours in a moo baan of about 100 houses use exactly the same method, I see it all over the land.

Am I missing something??

Are you referring to pumping from a metered supply, potentially causing a vacuum negative pressure to form where wither water is sucked back through any open feed line, or any system leaks are reversed and outside contaminates are allowed to ingress into a supposed fresh water system.

You mean that something?

I, like all of my neighbours in a moo baan of about 100 houses use exactly the same method, I see it all over the land.

Am I missing something??

Are you referring to pumping from a metered supply, potentially causing a vacuum negative pressure to form where wither water is sucked back through any open feed line, or any system leaks are reversed and outside contaminates are allowed to ingress into a supposed fresh water system.

You mean that something?

Absolutely no idea, I came here, rented the house, used the water.