Search: Posts Made By: djMax
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02-20-11, 02:50 PM
Replies: 9
Views: 11,173
Posted By djMax

We're trying to diagnose the valve as well. If I...

We're trying to diagnose the valve as well. If I connect PV to TH (24V) and/or MV to TH, shouldn't that gas valve open? We hear no gas and cannot light the burners with a manual flame, which says to...
02-20-11, 02:37 PM
Replies: 9
Views: 11,173
Posted By djMax

Fair enough. There's an overlay problem which is...

Fair enough. There's an overlay problem which is that sometimes we just can't get the thing to even try to fire. TH has 24VAC (27.5 actually) but PV and MV just never get anything. When it does fire,...
02-20-11, 12:23 PM
Replies: 9
Views: 11,173
Posted By djMax

Well normally not very far. Normally I think the...

Well normally not very far. Normally I think the spark tries once and then the whole thing shuts down. I had suspected this might be because it thought the valve wasn't opening? Anyhow, the last time...
02-20-11, 12:05 PM
Replies: 9
Views: 11,173
Posted By djMax

Ok, a few more tests and pokes and prods and it...

Ok, a few more tests and pokes and prods and it actually sparked and lit for about 1 minute. MV/PV and PV had 24V while it was starting then I stopped measuring. While it was running, before the fan...
02-20-11, 11:52 AM
Replies: 9
Views: 11,173
Posted By djMax

here is an in-action video: YouTube -...

here is an in-action video:

YouTube - Robertshaw problem (http://www.youtube.com/watch?v=dtSAm_mFUX8)

I don't totally know what causes it to "try again" so I'm still trying to get PV and MV/PV...
02-20-11, 04:22 AM
Replies: 9
Views: 11,173
Posted By djMax

Lenox G12 / RobertShaw SP735L won't start

I have a Lenox G12 furnace with a Robertshaw SP735L ignitor that won't start. I've had this problem for about 2 months, we always think we've fixed it but apparently never have (including a tech who...
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