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Topic: 2 amp or 3 amp does it matter?

mrshorsy

09/5/2010 at 4:29pm
Location: Nottinghamshire
Outfit: Swift Challenger 490 5 SEL

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Hi Trying to figure out why my thetford toilet wont squirt the flushing liquid and when I went to check the fuse it is a 2amp fuse yet on thetfords online help section it says it should be a 3 amp fuse does this matter?

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LegsDownKettleOn

09/5/2010 at 4:41pm
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Has the fuse blown? I would have expected a 2 amp fuse would be sufficient to work the pump, but would possibly blow after a prolonged pump. If the fuse has not blown then that is not the problem.

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mrshorsy

09/5/2010 at 5:44pm
Location: Nottinghamshire
Outfit: Swift Challenger 490 5 SEL

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not sure if fuse blown or not is there a way to test it?

-------------

'I feel sorry for people who don't drink. When they
wake up in the morning, that's as good as they're
going to feel all day. '
~Frank Sinatra

lesjane

09/5/2010 at 5:51pm
Location: Essex
Outfit: Elddis Hurricane GT

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Try a fuse that you know does work. If it still doesn`t work then it is not the fuse. Les.

alan126

09/5/2010 at 6:56pm
Location: West Scotland
Outfit: Fleetwood Garland and Almera

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i never bother testing dodgy fuses, you can get a packet of umpteen fuses of different values from the pound shop. if one is dodgy i replace the thing. if the thing still dont work then i investigate

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arc systems

09/5/2010 at 8:42pm
Location: None Entered
Outfit: http: www.arcsystems.biz

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The problem with a pump is it's driven by a motor, the motor needs more current to start it moving from rest than when it's running, add to that the load of the pump and the amperage required to start is double or more of when it's running.
So yes it does matter, a 'Timed' or slow blow fuse is also better that the more common 'Quick' blow, being timed it can take a short start-up over current without blowing.
Maplin's sell both types, quick blow in red packs and timed in green.

Most common problem with these pumps is if the seal between pump and motor dries out, this makes the motor very stiff to turn and this increase the amperage required way beyond the fuse rating
Taking the pump out and spinning the impeller with a little screwdriver until it's free, quickly cures this.

LegsDownKettleOn

09/5/2010 at 8:44pm
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If you can see a broken wire in the fuse then it's blown. You can check it with a multimeter if you have one, but a new fuse will cost a lot less than a multimeter.

mrshorsy

09/5/2010 at 8:56pm
Location: Nottinghamshire
Outfit: Swift Challenger 490 5 SEL

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Gary thanks as ever for your reply.

Took the pump out and the bits at the bottom span fine also replaced the fuse but still no joy any ideas?

-------------

'I feel sorry for people who don't drink. When they
wake up in the morning, that's as good as they're
going to feel all day. '
~Frank Sinatra

AndrewK

09/5/2010 at 11:28pm
Location: Oldham
Outfit: Burstner S500TS Nissan Patrol 3.0 SVE

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Quote: So yes it does matter, a 'Timed' or slow blow fuse is also better that the more common 'Quick' blow, being timed it can take a short start-up over current without blowing.

I replaced the fuse in the Lunar Saturn I used to have several years back. IIRC it was a 2amp slow blow.

Andrew

arc systems

09/5/2010 at 11:57pm
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It's far from uncommon for these pumps to pack up so you first need to be sure the fuse is ok and you at least have power down to the fuse, if still no good then replace the pump.
Not cheap but good news is the pump kit is simply attached to the existing wiring inside the holding tank, it comes with crimp connections and shrink wrap tubing to seal the connections.

mrshorsy

10/5/2010 at 5:47pm
Location: Nottinghamshire
Outfit: Swift Challenger 490 5 SEL

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Gary should I have a purply coloured blade fuse in the bit that turns the door to open and shut? there is a space for one but wasnt one in there

-------------

'I feel sorry for people who don't drink. When they
wake up in the morning, that's as good as they're
going to feel all day. '
~Frank Sinatra

arc systems

10/5/2010 at 10:21pm
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Pass on that! I've no idea unless perhaps it's a cunning place to keep a spare?

Googling Purple seems to throw up either 3A or 35A! depending on whose website you read??
Perhaps someone can confirm, but I think ones purple and the other probably mauve?

Rune Caster

10/5/2010 at 10:35pm
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My original one was purple - there was no rating on it - the fuse is on he turntable to open and shut the blade

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rune@tabbytha.com

Grampian91

11/5/2010 at 1:13am
Location: Midlands
Outfit: Mondeo Avondale Gram

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Poundshop fuses ... I remember when they had a safety recall on them. They didnt fuse.

Wonder how many other places bought from the same supplier though?

Rune Caster

11/5/2010 at 8:58am
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Quote: Originally posted by Grampian91 on 11/5/2010
Poundshop fuses ... I remember when they had a safety recall on them. They didnt fuse.

Wonder how many other places bought from the same supplier though?

Probably go the other way now - blow on installation

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Caravanning is a way of getting a cheap holiday out of an expensive hobby

rune@tabbytha.com

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