No water flow out of little giant

So when I tested the LG heater at home all was well. On the job today I couldn't get any flow of water out of it. I disconnected everything and reconnected and nothing. I had to go cold water extraction. The coil has been fixed twice. I didn't notice any leaks. Will a pin hole leak prevent water flow? Any hints thoughts. One of the QDs on the heater is new maybe Ill switch out the other one.

Anybody have a 3ht for sale?

If the coil isn't plugged (doubtful) it would have to be your QD.

Cold water extraction brings back memories.......bad ones.

Tell me about it. I was already to melt that filth like butta and got nada. It does have that drain bolt at the bottom I think Ill open that up too

IF no water comes out....you have your answer.

It wouldn't be the first time a QD failed right out of the block...had a couple do that last year. Being new, you assume that it couldn't possibly be the problem, but sometimes it really is.

Might also want to flush the coil with a garden hose to make sure you don't have an air pocket in there blocking the water flow. I've never seen it happen, but hot water and steam mixture can develop pockets just like your van's radiator.

Mo, do you use QD's on the heater to connect the in and out flow?

I've never seen a coil get clogged but have seen QD tappet springs get soft and not depress, causing no flow.

Do you have an air compressor?.......if so try blowing some air thew it

Yeah I do on both sides of it. I could eliminate in inlet one though. Good idea about the blowing it threw it. I was just going to open that drain bolt and flush it

Replace the QD's and I bet your prob is solved.

To check them, take them off and connect them together looking in the backside to see if the tappets depress on both sides.
The one that doesn't is the bad one.

QD would be the first thing that I would check.

Let us know what it was when you get it figured out Mo?

I'm on it tomorrow, Did you ever switch out the unitrols?

Not yet, but I'm planing on this weekend to do that.

I've just been doing Warm Water Extraction (WWE) lol, and haven't seen steam in months!

damn I should have QDs on the little giant to make it easier to pull out when I service it. I have a swivel on the cold side so its not terrible but much tougher than just QDs..

I agree though, its gotta be the QDs little inner nipple not depressing

They're brand new too. I have to disconnect to clean tile AC I have the low pressure one

So I got water out of the heater again. I just connected everything back and it started working... WTH? I did the same thing multiple times at the job released the pressure at the QD etc.

The only thing that I noticed is that the shut off valve at me lead hose was leaking but I doubt if that was the problem. For some reason it wasn't pressurized must have sucked in some air never happened before and hopefull it doesn't happen again

Sounds like an air pocket to me. Trapped air bubbles are incredibly resistant to bursting and can stop flow.

Good to hear it's working again.

Just in time to Im going this week

Where you going to?

Im going to be busy

It happened again on the first job today was working good all of a sudden lost pressure.  I put the solution line directly to the machine and no problem. I think Ill get rid of the QD that connects water from machine to LG . Arrhhhhh

Yup, it's a soft QD, I had the same problem last week, and it was a soft spring on a male QD.  

If one is worn out and soft, then when you connect them, male/female together the soft spring doesn't depress the other good one, and that's what keeps it from flowing........they rely on being equally as stiff to both depress each other for flow.  Wait, it sounds like I'm talking about a marriage here, M/F, no flow, depression.

You can usually feel the bad one by pressing on it with your thumb, to find the worn/soft one.

It's funny, how they just are intermittent in working or not......same as mine was last week. That's why I always have a set or two of new QD's in my van.

Spares are important....prefer to replace them in matching sets as well.

It quit after 2 rooms on the second job again. We'll see how it goes tomorrow after I removed on of the QDs, both sets are new. I have a feeling the coil isn't working properly. I don't see any leaks after it quits. I removed the cap and the silver solder area looks weird but not leaking.

I don't have a pressure relief valve on it. Do you guys think that might be the problem?

If the psi relief valve was opening, your water would be getting discharged through it....is the water exiting?

I would try this next. Start the tm and run the heater at full temp with a stopwatch. Note if / what time it shuts down. If it is at about the same time, then there might be an issue with the coil repair.

I wonder if the solder is expanding under heat and closing off the coil? Does the heater work again once it cools down?

I have no relief valve installed.

Ill try that timing thing. The first time I attempted to get it working buy just gave up and disconnected and cleaned with cold water