Cab 50. Cab50

  • Active since 1995, Hearth.com is THE place on the internet for free information and advice about wood stoves, pellet stoves and other energy saving equipment.

    We strive to provide opinions, articles, discussions and history related to Hearth Products and in a more general sense, energy issues.

    We promote the EFFICIENT, RESPONSIBLE, CLEAN and SAFE use of all fuels, whether renewable or fossil.
  • Hope everyone has a wonderful and warm Thanksgiving!
  • Super Cedar firestarters 30% discount Use code Hearth2024 Click here

Newport74

New Member
Oct 23, 2023
8
Pennsylvania
Ive looked at most of the posts with a similair problem.
Purchased a used cab 50.
Feeds pellets and lights.
Green led never comes on so no pellets are fed after initial start up unless reset hit.
Pressure switch has continuity with vac hose hooked up open with hose off.
Snap disc switches seem to funtion properly.
Replaced thermal couple(it was wired backwards but I corrected)
Im at the control board at this point unless someone has any idea what im missing.
Also any idea where i can get a schematic for the board. I found a wiring diagrahm but no schematic so far . Also there is a pick off to ground off the red thermal couple wire at the blade connector what is its purpose? Can i just ground red wire to test? Seems like yellow would be pof signal if red is tied to ground. Thanks in advance

[Hearth.com] Cab 50. Cab50
 
Last edited:
Also board knows when thermal couple disconnected or backwards it flashes amber in either of those conditions and red light under main fuse is on all the time calling for more pellets. Wiring appears in good condition but havent ohmed it out yet
 
I ordered a new control box ..I read 3mv between pins 1 and 3 of blade connector from thermal couple. I also ordered an I/C chip to see if I can repair this control box that part is $3 .
Ill update once either of those arrive and i have a chance to test
 
  • Like
Reactions: ARC
After replacing the control box the unit still would still start up but no green light. I reversed the thermal couple leads back the way it originally came wired (yellow to red and red to yellow) and the heater now runs perfect.
i guess reading ahead that some thermal couples are wired backwards threw me off in this case. Although wire colors were backwards electricaly the part was correct...