what causes grundfoss spa pump to get hot
Hot Tub Circulation Pump Troubleshooting
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Apportionment pumps used in spas and hot tubs, likewise chosen Circ Pumps or Hush Pumps, are depression-menstruation pumps that constantly broadcast the water (24/7) very slowly, to continuously filter, heat and chemically care for the water. Common spa/hot tub circulation pumps are made by Aqua-Flo, Grundfos, Laing and Waterway.
Not all spas have a circulation pump however. Many spas use a 2-speed therapy pump, with low speed used for constant circulation, and high speed used for turning the jets on high. The way to tell if a spa pump is a Circ Pump, and non a Therapy Pump, is past the Amps listed on the motor label. Annihilation under 1.five Amps would be a Circ pump. Therapy or Jet pumps have much higher Amp usage, and you lot would meet at least six Amps listed on the motor label.
Apportionment pumps tend to last 5-10 years, although your mileage may vary. I've seen them terminal only a few years, and I've seen them terminal 20 years, and I wish I knew the surreptitious to a long life, but it seems random. One thing for sure however, is that at some point in the life of a spa or hot tub, a apportionment pump will develop bug.
Here's how to troubleshoot a circulation pump on a spa or hot tub, to decide if the circ pump needs repair or replacement.
Apportionment PUMP IS DEAD
If there is no action at all from the circulation pump, your topside command panel should be giving you an fault code, possibly a FLO or OH. Check that power is on, and the billow or GFCI examination push button are non tripped. Bank check that all valves are in the open position. For piece valves, the handle should be Up, and for ball valves, the handle should exist parallel to the pipe. Follow the circ pump plumbing, and look for any possible kinks in the hose. Pull out the cartridge filter, to meet if flow improves and the circulation pump is doing better.
Apportionment PUMP IS MAKING NOISES
One of the best things about a hot tub circulation pump is quiet operation; they make virtually no dissonance. Gurgling, bustling or grinding noises on a spa apportionment pump are good indicators of a problem. It could be Air, Scale or a Clogged Impeller. Possibly a muddy spa filter. Or, it could be the bearings in the motor going bad.
AIR IN THE LINES: If you have just tuckered the spa, you may have anair lock on the circ pump. Some circ pumps have an air bleeder knob, or yous can loosen the union nut to release the air. Open the lock nut slightly until y'all hear air hissing, then tighten upward again as water begins to leak. You tin likewise pull out the spa filter and insert a garden hose into the hole, sealing around the hose with a clean cloth or sponge, to forcefulness air out of the lines.
SCALE DEPOSITS: Calcium or lime deposits tin built up and create dissonance that makes a 'hush pump', not so quiet. The impeller housing or the wet end embrace plate of a circ pump tin be removed to inspect the impeller. Be certain to cut off power kickoff, and shut valves on each side of the pump. If there are no valves, you can use a hard clamp on soft hoses, or plug a iii/4" line with wine corks. Inspect the hoses (pipes) and the impeller surfaces for any deposits. They can exist removed with a stiff brush, or a chemic like CLR.
Clogged IMPELLER: Circulation pumps usually pull water from the skimmer/cartridge filter, and information technology'south non uncommon that $.25 of debris, or even parts of the filter itself get sucked into the pump, clogging the impeller. Open up the apportionment pump as described above to cheque this possibility. Other possible clogs include downstream obstructions, in an ozone injection manifold, or specifically the Mazzei injector, or if a return fitting or drain cover is used, where the h2o returns to the spa, it could be clogged on the inside.
BAD BEARINGS: Inside of a normally quiet circulation motor are two bearings that ensure smooth rotation of the rotor within the stator. When these bearings age, they begin to shriek and bleat, or grind loudly. A examination to confirm is to disconnect the plumbing and turn information technology on very briefly, to see if information technology still makes funny noises. At this indicate, you lot either need to replace the bearings, replace the motor, or replace the unabridged circ pump.
CIRCULATION PUMP IS BARELY PUMPING
Spa circulation pumps don't wear out and pump less water over fourth dimension, they either piece of work or they don't. If y'all experience low book of water coming out of your heater return, the first affair to do is to remove the spa filter and run into if the flow improves. If subsequently cleaning the spa filter, the problem reoccurs, supplant the spa filter.
Secondary causes of actress low menses on a depression menstruum hot tub circulation pump include the items mentioned above; either there is air in the line, or something is blocking menstruation before the pump on the suction side, or after the pump on the pressure side.
If you decide to replace your hot tub apportionment pump, the job of really replacing a circ pump seems to be less trouble for most people than ordering the correct replacement circ pump for your particular hot tub. In my next post, I'll encompass Replacing a Hot Tub Circulation Pump, or how to select the correct make and model of circ pump, and install it yourself.
Happy Hot Tubbin'
Daniel Lara
Hot Tub Works
Source: https://lesliespool.com/blog/hot-tub-circulation-pump-troubleshooting.html
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