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Pump won't work when HX gets hot
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ellimatic
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Joined: 26 Feb 2013
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Posted Wed Aug 28, 2013, 1:37pm
Subject: Pump won't work when HX gets hot
 

Machine works fine when cold.  When machine gets hot, pump won't activate.  It's not the klaxon fuse as machine was idle and I replaced it twice.  Could it be the Cigar box?

Thanks
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frcn
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frcn
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Posted Wed Aug 28, 2013, 3:01pm
Subject: Re: Pump won't work when HX gets hot
 

Try with the case removed and a fan blowing on the box to keep it cool. Check for voltage going to the pump when it won't work. Try disconnecting the pump and wiring it to a jumper cord directly to the mains. Check the mains voltage as well. This is a good time to pull out the Kill-O-Watt meter.

 
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DanoM
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Posted Wed Aug 28, 2013, 3:37pm
Subject: Re: Pump won't work when HX gets hot
 

ellimatic Said:

Machine works fine when cold.  When machine gets hot, pump won't activate.  It's not the klaxon fuse as machine was idle and I replaced it twice.  Could it be the Cigar box?

Posted August 28, 2013 link

On my NS Oscar the Gicar controller went out.  First symptom, when I bought the system used, was it would heat, but do nothing else and show low water level light until it heated for at least 15 minutes.  After that the pump would work properly, low water level sensor light would turn off, and all seemed well.  (All seemed well, but eventually it forgot to fill the boiler and turned on the heater blowing the element in the process.)

I've got a new controller now and everything works like it's factory new again.

Be sure and label those wire/plug connections to the Gicar controller if you are going to disconnect it.  Makes reassembly much easier than trying to track down cable connections!
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ellimatic
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Joined: 26 Feb 2013
Posts: 11
Location: Connecticut
Expertise: I love coffee

Espresso: NS Ellimatic
Grinder: Vario
Posted Fri Aug 30, 2013, 6:13am
Subject: Re: Pump won't work when HX gets hot
 

Thank you guys.  Good ideas to isolate the issue.  I'll try to get to it this weekend and let you know what I find.
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PeterWWbeagle
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Posted Thu Sep 5, 2013, 8:54pm
Subject: Re: Pump won't work when HX gets hot
 

frcn Said:

Try with the case removed and a fan blowing on the box to keep it cool. Check for voltage going to the pump when it won't work. Try disconnecting the pump and wiring it to a jumper cord directly to the mains. Check the mains voltage as well. This is a good time to pull out the Kill-O-Watt meter.

Posted August 28, 2013 link

this is great advice.  also check temp of the input water.  Ulka pumps do not like pumping hot water.  I have seen threads were the water tank heats up from being near the boiler and the pump just stops.  a big reason why many insulate their boiler in a pour over machine.
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