Question about Rainbow E series Canister Wet/Dry Vacuum

1 Answer

I used to be a dealer and used to repair rainbows in my shop but its been solong now that I can,t remember everything about it now. I have an eseries model in the 93xxxxxxxx serial numbers. If iI remember correctlly, is there not a circuit breaker that will shut the rb off if it overheats and then start after it cools down? If so, will this breaker go bad sometimes and keep shutting the RB down or is there another problem that might need to be corrected to fix the situation?

Posted by on

  • Ron Kimbel Jan 06, 2011

    I know there is an answer. Is there a knowlegable Rainbow dealer out there?!!!

  • Ron Kimbel Jan 11, 2011

    Thanks! I used to replace thermal fuses on the D4/SE's and I had forgotten this. I appreciate your help very much!
    Best regards,



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 1,140 Answers


The answer to your question is yes. There is a "circuit breaker" within the vacuum although it's often referred to as a thermal fuse or thermal cut-off. A circuit breaker is essentially a re-settable fuse so same difference. It is not uncommon for the thermal fuse to develop a fault " or go bad". It is essentially a thermostat and can fail or develop a fault in the same way that a thermostat in an oven or dryer can - and does.

If it fails in the "open" position, the power circuit to the motor is incomplete and the vacuum will not run. If it fails in the closed position, the vacuum will run but power to the motor will not be cut if the vacuum overheats. The fuse comprises a bi-metal strip which can distort through prolonged cycles of heating and cooling. When this happens, the fuse will still function, but will cut power to the motor - usually at too low a temperature. This appears to be what is happening in your case.

The thermal fuse is usually in-series and located on the common/neutral wire near the motor - or attached to the common terminal on the motor. I service and repair vacuums but I haven't worked on this particular model so will need to check on the exact location and get back to you.

The fuse is an essentially safety feature and, if faulty, needs to be replaced. The thermal fuse can normally be removed and the vacuum will work without it, but this should only be done for testing purposes and when it's certain that the fuse is faulty - which is when it fails in the open/no power position.

Unfortunately, there are other factors which will cause the same "fault". It's possible that the motor is starting to burn out or there is a partial blockage somewhere causing reduced air-flow to the motor causing it to overheat more quickly than normal. To determine the cause of the fault, you should initially check the hoses, etc for any blockages and clean or replace your filters.

If these are all OK, you will need to perform resistance testing on the motor with an ohm-meter. Unfortunately, simply testing between the hot and common terminals is not sufficient to determine whether or not the motor is faulty. This will only give you a reading for one of the armature windings and there are several of these.

To adequately test the motor (i.e. all of the armature windings), you need to remove the motor and the brushes and test each armature winding individually by rotating the motor slowly by one full turn and probing the opposing commutator segments. You should be getting a resistance reading of about 0.5 ohms through each winding. If this reading suddenly increases dramatically, then one of the windings is damaged which would cause the motor to overheat too quickly and eventually burn out.

With the brushes removed, you can also test the stationary (field) motor windings by probing the live/hot and common/neutral terminals. Again, you should be getting a resistance reading of about 0.5 ohms.

If you have checked the vacuum for blockages, the filters are clean, and testing reveals that the motor is sound, then it's almost definite that the thermal-fuse needs to be replaced. Unfortunately, on some vacuums, the thermal fuse is only supplied with the motor and cannot be bought separately!

I hope this will assist you in solving your problem. I will check on the location of the thermal-fuse for your vacuum and, if possible, supplier details and the part number and get back to you asap.


Posted on Jan 08, 2011

  • 1 more comment 
    DILLIGAF Jan 08, 2011

    I'm sure I don't need to tell you this, but I have to cover my a** so, in the interests of your safety, please disconnect the vacuum from the power outlet before any dis-assembly or testing of your vacuum.

    DILLIGAF Jan 08, 2011


    Unfortunately the thermal fuse on the E-Series is integral to the motor (in-series on the field winding)and is not available as a separate part. If it has failed or is faulty, the motor will need to be replaced. Unfortunately, this is going to be rather expensive ($200+) so I would definitely recommend performing the checks I described above before committing to this.

    I omitted to mention that this fault can also be caused by worn motor brushes or worn motor bearings (causing uneven wear on the brushes). Either of these would generate additional heat, causing the thermal fuse to trip correctly, although seemingly prematurely.

    If you are planning to disassemble the vacuum to test the motor, you should also check the brushes for excessive/uneven wear and verify that the motor rotates freely with no "play" in the bearings. Please ensure the power is disconnected at the wall before attempting any inspection or repair on your vacuum and make note of the correct wiring connections to the motor.

    I trust this sufficiently answers your question. If you need any further assistance - or help with sourcing suppliers/parts - please let me know.



    DILLIGAF Jan 12, 2011

    No problem - glad I could help. I know my way around most vacuums, but I've only worked on a few Rainbows in my time. They aren't very common here. As an ex-dealer, you've probably forgotten more about these than I know ;)



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Rainbow turns on for a second or two then quits and won't turn back on.

If you have the model Rainbow E-2 eSERIES then the Motor Rainbow 120v could be going bad. This will trip the auto reset until it cools down.
If you have an E2 Type 12 Rainbow, then the Controller Asm 120v e2 Silver Gold could be going bad.
Our technical support team is available if you need... Contact Us


Mar 24, 2016 | Rainbow E series Canister Wet/Dry Vacuum

1 Answer

Armature and rainbow vacuum

The armature for the E-2 (eSERIES) model Rainbow is not available by itself. You have to purchase the Motor Rainbow 120v.
Now the new design motors are steps above the original motors so you should see improved performance as well as durability.
Our tech. team is available if needed... Contact Us


Jun 18, 2014 | Rainbow E series Canister Wet/Dry Vacuum

1 Answer

Rainbow vacuum won't power on.

Do you have it on the water pan? All models above the eSERIES will not run without the water pan.

Jun 15, 2012 | Rainbow E series Canister Wet/Dry Vacuum

1 Answer

How do I get the motor out of the power nozzle on the E-series?

The eSERIES Rainbow has several versions of the power nozzle. Some screw apart and others have snap connections. Look at our website on the manuals page to determine your model. You can also call us and speak to a Rainbow Specialist.

Jun 02, 2012 | Rainbow E series Canister Wet/Dry Vacuum

1 Answer

Why would the motor of a Rainbow E series vacuum cleaner be made

The bearing for the single speed eSERIES is available on our website. Click here


Mar 18, 2012 | Rainbow E series Canister Wet/Dry Vacuum

1 Answer

I changed the hepafilter on my eseries Rainbow Vacuum cleaner, I rinsed it with water,put everything back and now it wont turn on.

please dry the hapafilter before putting it back
and then try switching on
thank you
with regards

Jan 25, 2011 | Vacuums

3 Answers


Your Rainbow E series has lost suction power, because you need a new hepa filter, ot your water basin gasket is messed up, or the center motor gasket is messed up or out of position.

Make sure your water basin is not cracked or broken, also.

If you have any more questions let me know. I am a Rainbow seller, and a Rainbow expert also.

Thank you,

May 19, 2010 | Rainbow E series Canister Wet/Dry Vacuum

1 Answer

Loud rainbow and water leaking

If pieces are missing or broken I would try and replace the piece. You can usually get these items cheap on Ebay.

Apr 08, 2008 | Rainbow E series Canister Wet/Dry Vacuum

Not finding what you are looking for?
Rainbow E series Canister Wet/Dry Vacuum Logo

Related Topics:

620 people viewed this question

Ask a Question

Usually answered in minutes!

Top Rainbow Vacuums Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18407 Answers

Joseph Hoffmann

Level 3 Expert

1706 Answers

Jax Planet
Jax Planet

Level 2 Expert

922 Answers

Are you a Rainbow Vacuum Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides