Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Ultra 155 not firing when calling for heat

I have an Ultra 155 that apparently stopped working over night. Fortunately, I have an outdoor wood boiler running so I still have heat at least somewhat.
The display shows 0 and water temp. If I hit reset, the system runs through its startup and I can hear the boiler circulator pump run (and verified with voltage check) and then shut off. According to the manual, all fuses were checked. Manual says to jump terminal 5 and 6. When i do that, fuse F1 blows. The manual doesn't say what to do in that situation. Any ideas?
Further actions require replacing the control module which of course is discontinued (part number 383-500-190).

Welcome

It looks like you're new here. Sign in or register to get started.

Comments

  • ktm250rider140
    ktm250rider140 Member Posts: 3
    Correction, jumping low voltage 5 and 6 has no effect on the operation
  • Ironman
    Ironman Member Posts: 7,720
    Which terminal block are you jumping 5&6 on, the red or the gray?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • ktm250rider140
    ktm250rider140 Member Posts: 3
    5 and 6 on the low voltage terminal strip. However, the importance of following the troubleshooting procedure. Step 2, which i ignored proved that the space heating was turned off. Not sure how that happened or got reset during all the power cycle. But its back to working.

Welcome

It looks like you're new here. Sign in or register to get started.

Welcome

It looks like you're new here. Sign in or register to get started.