Gas boiler. It's a HB smith

Jpat123 · February 11

Hi everyone i have a Gas boiler that comes on burns for 20 minutes

Then goes out and don't come back on

I changed the board and the thermocouple

It came on for a awhile and shut down and will mot come change out the board twice

pedmec · February 11

when you say does not comeback on what do you specifically mean? what kind of boiler are we talking about here?

EdTheHeaterMan · February 11

Is there a control that is locking out for some safety or other reason that needs to be reset? There are many gas boiler controls that will "RESET" by cycling off the power to the control. Does this sound like your problem? When did the problem start? Does turning the power off and back on get the burner to light? What is the model number of the boiler or perhaps the burner control?

Does your gas valve use a standing pilot? (constant pilot flame burning ignition)
Is there an ignition control that lights the pilot each time the burner lights?

Jpat123 · February 11

I have a HB smith boiler model number G100-w-6 con it use to work if I cut the power off and back on then it completely stopped that's when I replaced the thermocouple and the board it work for 20 minutes the it went out I still had a flame on the pilot but no burners found out the board was no good again now the same thing has happened

Jpat123 · February 11

Yes a standing pilot

Jpat123 · February 11

This is the boiler

Steamhead · February 11

What "board" did you replace?

EBEBRATT-Ed · February 12

By "board" do you mean the ignition control?

EdTheHeaterMan · February 12

Jpat123 said:
I have a HB smith boiler model number G100-w-6 con it use to work if I cut the power off and back on then it completely stopped that's when I replaced the thermocouple and the board it work for 20 minutes the it went out I still had a flame on the pilot but no burners found out the board was no good again now the same thing has happened

If the gray box is "the board" then you must have something wired incorrectly. Those Honeywell Aquastats should last for over 20 years in most heaters. even longer...

Can you tale a picture of what you re calling "the board" with the cover off so we can see the wires inside?

Jpat123 · February 12

The control board

mattmia2 · February 12

This has no control board, it has a bunch of safeties and operating controls wired together point to point.

mattmia2 · February 12

1. You should get someone to clean this and test the safeties, though a gas boiler arguably doesn't need annual service like an oil burner, it still needs to be cleaned and tested from time to time and this is over due.

2. What thermostat is controlling this? Does it stay on if you jumper the thermostat connection, usually T-T?

Jpat123 · February 13

I just bye passed the 2 safety switches and its currently working I am gonna go purchase new ones and see if that's the problem .

mattmia2 · February 13

DO NOT OPERATE THE BOILER AND CALL A COMPETENT PROFESSIONAL IF THAT IS HAPPENING. The safeties are almost certainly doing their job and you have spill or rollout both of which could kill you.

HVACNUT · February 13

Jpat123 said:

I just bye passed the 2 safety switches and its currently working I am gonna go purchase new ones and see if that's the problem .

I'll dial 9-1, and when you say go, I'll hit the other 1. Got your hard hat on? Clean undies?

Jamie Hall · February 13

I hope it's now off at the emergency switch and you have help coming to find out what's wrong.

Those switches aren't called "safety switches" out of whimsy.

Jpat123 · February 14

I ordered 2 of these so I could replace them
My boiler been running hitting temp and turning off and on
So far so good thanks for the help guys
I'll let everyone know how i make out

Steamhead · February 14

That's the "roll-out" safety. If this thing is going bad, there is something else VERY wrong. You need to shut it down and call a pro NOW. Where are you located- we might know someone........

Gas boiler. It's a HB smith

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