At the beginning of each seam, hold the top and bottom threads up and away under the presser foot.
Check your tension settings for your upper thread – see below on adjusting your tension. A properly threaded sewing machine with the correct tension settings should set you on your way to happy sewing.
Adjust your upper thread tension slowly and inspect your test fabric for signs of improvement or decline in how the stitches are coming together.
When I try to sew with a double needle, it only sews on the left hand side needle and not on the right hand side needle. T-shirt fabric is different, maybe you’ll need a needle that is thinner, here in my country they call it jersey needle. Also realize that the wiring and equipment described herein represents the “average” pool or spa equipment.
Any form of rough handling can put pressure on the part of the heater that sticks out the most – the Electrical Terminal, which is welded to the Cold Pin, which in turn passes through the Epoxy End Seal to get to the Heating Coil inside of the element.
Without the GFCI there will eventually be arcs, sparks, flames and anger – you can bet on that. Rarely, maybe never, is the element itself at fault when noise is reported in a heater, even though it is the element that is usually making the noise. In the normal operation the heaters that we deal with daily in pools and spas operate at temperatures only a few degrees above the temperature of the water that is flowing past them. One of three things can happen – A) the water flow slows down too much, B) the water flow stops, or C) the heater is somehow turned on with either no water in the housing, or only partially filled. Just one or two small holes are blown through the Sheath – not as dramatic as a complete, explosive meltdown, but just as costly. No holes are visible, but the walls of the Sheath are bulged outward in spots, the normally smooth surface of the Sheath are now bumpy and has become discolored. HIGH LIMIT PROTECTION – the primary job of the High Limit Switch in the finished product is to prevent scalding water from ever reaching the people using the product.
Following that, the service technician arrives and finds the heater assembly full of water again, and claims that it couldn’t have been a dry fire. We think it’s a safe bet to say that one of the major causes of heater failure has always been corrosion. Well, a full discussion of the chemistry and electro-chemistry involved with this pretty complex subject is beyond the intent of this Handy – Dandy Guide.
Unfortunately, that’s not going to happen, and all of those spas are going to continue being filled with water of every type, from the Cascade Mountain’s rain water to big-city sludge. Then, to add to the problem, we have learned that many, many spa owners are not following all of the instructions they’ve been given about pH, Total Alkalinity, Calcium Hardness and Total Dissolved Solids; or about how to handle those unique water problems that may exist in their spa when it is filled with water from their tap. An element or heater corroded because the water has a low pH is easy to spot – it has pieces eaten away from its surface. Bad-chemistry corrosion can show up where the element sheath is brazed to the bulkhead fitting, or welded to a mounting plate.
Very special welding techniques are used at these joints to make sure that no impurities are left behind that might corrode.
Corrosion of the metal in a pool or spa heater happens when the water becomes corrosive because somebody makes mistakes with its chemistry. There are more than 2,000,000 spas in the USA alone that have never shown any signs of corrosion – some more than twenty years old.
It’s exactly the same as a light bulb burning out – it just gets tired of the tremendous trauma it goes through each time the power is applied.


Because of the careful selection of components in the Heating Coil, this sort of failure is actually quite rare.
Another suspect in an OPEN situation is a reduced water flow that causes the element to operate at a much higher temperature than normal, but not high enough to cause a dry-fire condition. Of any piece of equipment you might find on a spa or tub today, the electric heater is probably the most simple, we’re not talking about the controls, now – just the heater itself. You can learn just about all there is to know about an electric heater by applying a little knowledge and a smidgen of easy math, along with a decent test meter.
First, measure and compare the voltage at the heater terminals with the voltage at the panel board, receptacle or other power source. Watch as director of the new live action Jungle Book, Jon Favreau, talks about his reimagining of the Disney animated classic. Bring some Disney magic to your next picnic or outdoor BBQ with this adorable DIY Mickey Mouse Bean Bag Toss!
Your posts have been very helpful in finding how to thread the machine, laying out pattern pieces, and things I should be sure to have on hand. I think the needle number is 70.But then me too I got that problem with t-shirts in the past. This section is presented for the do-it-yourselfer who needs some help either troubleshooting or repairing their own pool or hot tub spa. If you are not capable of performing a repair yourself, please contact a local pool or spa professional or a licensed electrician in your area. We will not be held liable for any injuries that may result from the troubleshooting or installation of any electrical components in your pool or hot tub spa unit.
If the Electrical Terminal is broken away from the Cold Pin there is obviously no way to connect electrical wires to the heater, and it becomes a throw away.
Signs of severe fracture or chipping are an almost sure bet that the End Seal is no longer able to do its job – to seal.
The huge amount of water moving rapidly past the element can set up some wild vibration patterns as it twists and turns through the heater. If the thermostat in a spa is set up to maintain the water at 102?, for example, the temperature of the Incoloy Outer Sheath will be about 110?.
This is approaching the melting point of the Sheath and it will get there quickly if it isn’t turned off by some safety device like a high limit switch. The Heating Coil wire is hanging out in all directions and the MGO Filler is cracked, smashed and blown away. Inside of the element the Heating Coil may be broken; or it might be electrically shorted against the Sheath. Sure, the thermostat should shut the heater off long before the point at which the High Limit Switch is needed, but thermostats, like everything else, fail.
Unfortunately, when these things fail, they generally fail in the closed position and there is no indication that they are not doing their job. Given any chance at all, this demon will destroy a heater element or, in many cases, the entire heater. It’s much easier to describe what doesn’t cause it than to attempt to explain all of the chemistry that does. Remember now, this is not just saying that there is acid in the water – it says that the water has become an acid. In some ways scale can be considered as the opposite of acid: with scale the water has too much of something and wants to get rid of it, and the nice warm heating element is a good place to deposit it.
There may be no signs of the problem on the outside of the element – it just got tired of working too hard.


Let’s say you want to figure the amps rating of a heater marked 240 volts & 5500 watts.
Don’t blame the heater for poor performance if this measured voltage is more than 10% below the heater’s rated voltage.
From each terminal, one at a time, to the element sheath or element mounting plate: should read OPEN or INFINITY. This time, it's all about Minnie Mouse at Shanghai Fashion Week and Jaleesa Moses gets you the front row style scoop.
They told me(in the shop of sewing parts) that I need a special sewing machine (overlock machine with 3 needles) and I should use extensible thresd (like sock thread). Here we are assuming that if you have chosen to work on your own unit, you have a basic knowledge of electricity. If you are in doubt as to how to properly troubleshoot or repair your specific unit, please contact a local pool or spa professional or a licensed electrician in your area. Then, the next time the element is energized, the moisture in the element may provide a path for current to flow, and the GFCI will trip. One wrench holding the Terminal Hex to keep it from turning, and one on the Terminal Nut to do the tightening or loosening. Usually it is simply a matter of re-aligning the element by a bit of gentle bending to move it away from the heater housing; or tying the noisy part down with a clip or wire made for the purpose.
The water flowing past the element is carrying the heat away just about as fast as the element can produce it. The element is totally destroyed, and frequently the Stainless Steel Heater Housing may be damaged as well. In most cases a spa system will work just fine with a stuck pressure or low switch – until there is a need for it.
Come to think of it, we’ve seen a few heaters that looked like rats had been gnawing on ‘em. Consider this: if all of those spas out there were filled with clean, pure water, and no one ever added any chemicals to them, the word corrosion would soon leave our vocabulary. The problem is that it’s like asking a Hawaiian to run a marathon in Honolulu dressed in a fur coat, wool cap and mukluks.
It doesn’t have any coils like motors and transformers, giving them inductive characteristics; and it isn’t anything at all like a solid state, printed circuit board mounted, microprocessor based control system.
You can now re-calculate the wattage using the voltage, amps and ohms numbers you have measured, confident in your knowledge.
You don’t want to mess around with anything electrical unless you know what you’re doing! But, a BIG BUT, – the heater may have been on just long enough to produce enough heat to drive that moisture out of there. If the High Limit is not sensing the water temperature close to the element, and the pump suddenly quits – it’s dry fire time in just a minute or two. He’s going to have a rough time getting rid of the heat he’s generating, and probably won’t finish the race.



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