what causes grundfoss spa pump to get hot
Hot Tub Circulation Pump Troubleshooting
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Circulation pumps used in spas and hot tubs, also called Circ Pumps or Hush Pumps, are low-catamenia pumps that constantly circulate the water (24/seven) very slowly, to continuously filter, heat and chemically treat the water. Common spa/hot tub circulation pumps are made past Aqua-Flo, Grundfos, Laing and Waterway.
Non all spas take a circulation pump however. Many spas utilize a 2-speed therapy pump, with low speed used for abiding apportionment, and loftier speed used for turning the jets on high. The style to tell if a spa pump is a Circ Pump, and non a Therapy Pump, is by the Amps listed on the motor label. Annihilation under 1.five Amps would be a Circ pump. Therapy or Jet pumps take much higher Amp usage, and y'all would come across at least 6 Amps listed on the motor label.
Apportionment pumps tend to last 5-10 years, although your mileage may vary. I've seen them final only a few years, and I've seen them final 20 years, and I wish I knew the secret to a long life, but it seems random. One affair for sure however, is that at some point in the life of a spa or hot tub, a circulation pump will develop bug.
Here'southward how to troubleshoot a apportionment pump on a spa or hot tub, to determine if the circ pump needs repair or replacement.
Circulation PUMP IS DEAD
If there is no action at all from the circulation pump, your topside control panel should be giving you an error code, possibly a FLO or OH. Check that ability is on, and the breaker or GFCI test button are non tripped. Cheque that all valves are in the open position. For slice valves, the handle should be Up, and for brawl valves, the handle should be parallel to the pipage. Follow the circ pump plumbing, and look for whatever possible kinks in the hose. Pull out the cartridge filter, to see 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 almost no noise. Gurgling, humming or grinding noises on a spa circulation pump are good indicators of a problem. It could be Air, Scale or a Clogged Impeller. Maybe a dirty spa filter. Or, information technology could exist the bearings in the motor going bad.
AIR IN THE LINES: If you have only drained the spa, you may have anair lock on the circ pump. Some circ pumps have an air bleeder knob, or you can loosen the union nut to release the air. Open up the lock nut slightly until you hear air hissing, so tighten upwardly again as water begins to leak. You can also pull out the spa filter and insert a garden hose into the hole, sealing around the hose with a clean cloth or sponge, to force air out of the lines.
SCALE DEPOSITS: Calcium or lime deposits tin can congenital up and create noise that makes a 'hush pump', not so quiet. The impeller housing or the wet stop encompass plate of a circ pump can exist removed to inspect the impeller. Be certain to cut off power start, and close valves on each side of the pump. If at that place are no valves, you tin use a hard clamp on soft hoses, or plug a 3/4" line with wine corks. Audit the hoses (pipes) and the impeller surfaces for any deposits. They can exist removed with a stiff brush, or a chemical like CLR.
CLOGGED IMPELLER: Circulation pumps unremarkably pull water from the skimmer/cartridge filter, and it'southward not uncommon that bits of debris, or fifty-fifty parts of the filter itself get sucked into the pump, bottleneck the impeller. Open upwards the circulation pump every bit described in a higher place to bank check 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 exist clogged on the within.
BAD BEARINGS: Inside of a normally quiet circulation motor are 2 bearings that ensure smooth rotation of the rotor inside the stator. When these bearings age, they begin to shriek and squeal, or grind loudly. A test to confirm is to disconnect the plumbing and turn it on very briefly, to run into if information technology even so makes funny noises. At this point, you lot either demand to supervene upon the bearings, supervene upon the motor, or replace the entire circ pump.
Circulation PUMP IS BARELY PUMPING
Spa circulation pumps don't wear out and pump less water over time, they either work or they don't. If yous feel depression volume of water coming out of your heater return, the commencement matter to do is to remove the spa filter and encounter if the flow improves. If subsequently cleaning the spa filter, the problem reoccurs, replace the spa filter.
Secondary causes of extra low menstruum on a depression catamenia hot tub apportionment pump include the items mentioned to a higher place; either there is air in the line, or something is blocking menstruation earlier the pump on the suction side, or subsequently the pump on the pressure side.
If y'all determine to supplant your hot tub circulation pump, the job of actually replacing a circ pump seems to be less problem for most people than ordering the correct replacement circ pump for your item hot tub. In my adjacent mail service, I'll cover Replacing a Hot Tub Apportionment Pump, or how to select the correct brand 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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