two resistors burnet up on my control board...Tried replacing them and they burnt up again. Any suggestions on what might be causing this. The original proble was the auger was not feeding I by passed the vacuum switch and disc number 2 and shorted out the motor which inturn shorted out the board.
Need Help on Quadra-Fire part # SRV7000-205
- Thread starter royc
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(broken link removed to http://www.ebay.com/itm/Quadrafire-Control-Box-3-Speed-SRV7000-205-Castile-/170552662093)
If you have a shorted motor you don't want to just plug in a new control box and blow that one as well.
4Dtvman
New Member
Replace the 2 resistors and un-plug everything. Then plug one item at a time and see which item will burn the resistors.
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I replaced the two burnt out resistors found another adjacent resistor that needed to be replaced, unplugged the exhaust fan motor and plugged in the board. The resistors did not burn out, as soon as I plugged the exhaust fan the resistors started to burn out. I checked the resistance across the exhaust fan and got a reading around 15 ohms. Don’t think this would cause the resistors to burn out. Went through the entire process again, but this time I plugged the convection fan to the same leads that the exhaust fan was plugged into, same results the resistors started to burn out. I'm assuming that the motor fans are fine and that there is something else wrong with the board. I have attached the picture of the board and have circled the resistors that keep burning out. Any suggestions would be greatly appreciated.
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Than keep looking for the problem, igniter, combustion blower, bad ground, frayed wires. It is there somewhere and not in the box.
Eric
4Dtvman
New Member
Can you check that regulator on the left Q4. The middle leg should be ground. Ohm it out to a ground plane and check resistances to the other 2 legs. The one on the bottom should be input voltage and the top should be regulated voltage. If everything looks good under power. Place your lead on the top leg and slowly plug in one fan for a couple of seconds. See if it goes down.
Harvey Schneider
Minister of Fire
Just an educated guess:
The triac is probably shorted and the gate resistors are blowing. There isn't any power at the triac if there isn't a load.
The triac is probably shorted and the gate resistors are blowing. There isn't any power at the triac if there isn't a load.
4Dtvman
New Member
Update. I just recieved a new board, plugged it in and everything seemed like it was working fine. I pushed the vacuum switch in and sparked now getting 90 volts out to the auger motor. Any suggections?
Harvey Schneider
Minister of Fire
What do you mean you 'pushed' the vacuum switch in??? What sparked?
If both the convection and exhaust blower blew that resistors while plugged into the SAME TWO WIRES, then I would be looking at those two wires from one end to the other! Unplug the box so you aren't reading any resistances from it and check resistance from the plug end of each wire to chassis ground. If you read 0 ohms or close to it, then you have a short circuit to look for.
If both the convection and exhaust blower blew that resistors while plugged into the SAME TWO WIRES, then I would be looking at those two wires from one end to the other! Unplug the box so you aren't reading any resistances from it and check resistance from the plug end of each wire to chassis ground. If you read 0 ohms or close to it, then you have a short circuit to look for.
One if the vacuum connector feeds sparked and now I'm only getting 90 volt reading from the control board to the vacuum switch
I just doubled checked and I'm definitely only getting 90 volts from the control board to the vacuum switch. I also tried unplugging the exhaust fan to ensure that nothing was causing a voltage drop, checked voltage to the exhaust fan 120 volts thats fine. Something in the control board is causing a voltage drop on the vacuum switch circuit. Any suggestions on what that might be?
Harvey Schneider
Minister of Fire
The 90 Volts suggests a damage triac. Separate everything and look for short circuits across components and to ground. By components, I mean motors switches and even circuit boards.
Traced the problem back to F2 fuse. Temporarily bypassed the fuse and had 120 volts to the auger. Now the auger will not turn off. What controls the relay to the auger? any suggestions much appreciated
There are/were three different posts going now about Quad augers running continuously and I think we'd all love a definitive answer to that one! Too bad no one has a schematic for the board.
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