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Old 12-25-2012, 06:55 AM   #1
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OK - so I'm alone here on Christmas and I'm using my toner


I'm diagnosing an open fault on an overhead radiant heat system. 240V, 20A circuit, SPST thermostat. I've already opened up a small hole and have full access to the overhead system.

I'm getting an infinity reading on ohms, but I located a break with my toner and repaired it, and STILL no connectivity.

I'm using my toner, and I can tell there is some kind of connection between the t-stat drop and where I found the break (loud LOUD tone, same as if I touch the toner to the other end of the wire), but when I use my long lead to test DVOM continuity at that point I'm still getting infinity.

So - with the wire exposed I get 100% tone continuity to this spot, but when I use my ohmmeter I still show infinite. Frustrating.

Help!

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Old 12-25-2012, 07:10 AM   #2
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OK - so I'm alone here on Christmas and I'm using my toner


Will the unit run if the thermostat is jumped out at the unit itself? If so replace all the tstat wire since you already found one break.

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Old 12-25-2012, 07:50 AM   #3
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OK - so I'm alone here on Christmas and I'm using my toner


No, I'm just not getting continuity. The t-stat is working fine. I think I may have isolated another break point near the wall-"up" line on side b

My plan is to slowly identify any breaks using side A, till I get right near the t-stat. I'll post back after fixing this break #2
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Old 12-25-2012, 11:50 AM   #4
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OK - so I'm alone here on Christmas and I'm using my toner


Done and done. I'm sure I wasn't the most efficient finder of broken spots, but after three cuts into the ceiling I got a good solid tone from the whole grid.

Checked continuity - 70 ohms of resistance, plugged in the breaker, drawing 7 amps from dead cold. Good deal - and thanks to DIY Chatroom!

Drinks for everyone!!
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