Ask Experts Questions for FREE Help !
Ask
    shartov's Avatar
    shartov Posts: 5, Reputation: 1
    New Member
    		  
    #1

    Oct 13, 2009, 01:31 PM
    Boiler don't fire up
    Hello all.
    This is an old weil mclain e.g. 75. Pilot is on, but the unit will not start. Changed the thermocoupler and nothing happen. Jumped the 2 wire mercury thermostat and still nothing. A week ago I had electric power problems in the house like short drops lights will dim a bit and came back to full power, computer was shot down and so on. Con Ed came and fix it outside at the pole. Is this problem may have something to do with the boiler? Maybe something went wrong with the control transformer (24 Volts) .
    This is the first attempt to start the boiler after the summer and the pilot light was on all this time (for nothing - last time I'll do that! )
    Any help?
    Thanks in advance, shartov.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 13, 2009, 01:33 PM
    Check for 120 volt power to the boiler
    Then check for 24 volts out of the transformer
    If both of those check out OK then you will have to use your electric meter to back track the circuits till you find the one holding off the boiler.
    shartov's Avatar
    shartov Posts: 5, Reputation: 1
    New Member
    		  
    #3

    Oct 13, 2009, 02:29 PM

    Hi... thanks for the reply... the transformer and boiler has power... no power at the thermostat.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Oct 13, 2009, 02:50 PM
    You are at this point now.

    If both of those check out OK then you will have to use your electric meter to back track the circuits till you find the one holding off the boiler
    shartov's Avatar
    shartov Posts: 5, Reputation: 1
    New Member
    		  
    #5

    Oct 14, 2009, 05:29 AM

    Thanks for the advise... I found the problem at the rollout fuse... boiler is working now. :)
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #6

    Oct 14, 2009, 07:46 AM
    Good deal and it did not hurt to bad. PS I hope you replaced that very necessary safety device and also located the reason for its failure.
    shartov's Avatar
    shartov Posts: 5, Reputation: 1
    New Member
    		  
    #7

    Oct 15, 2009, 12:58 PM

    Hello there and thanks for the concern... yes, I did replace the ceramic rollout fuse the reason to the problem I found too... last year when I replaced the thermocoupler the supply tube to the pilot broke and local store got me similar but larger tube which with the time leaked gas to the botom... I notice fire on top and botom of the pilot... I guess this extra heat fail the system by breaking the rollout fuse. I change the gas line tube now to the correct size. Wow... thanks again
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #8

    Oct 15, 2009, 01:00 PM
    I hope your problems are solved.
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Boiler won't fire up when raising themostat [ 1 Answers ]

My boiler won't come on when I raise the upstairs thermostat, but will come on when I raise the downstairs thermostat.

Rheem boiler burners will not fire up [ 2 Answers ]

I have an older Rheem gas hot water boiler heater - pilot is on, and I have turned up the thermostat, which appears to be working (saw a spark in the mercury when I turned it up) - burner is not coming on - what's wrong?

Shower won't fire boiler [ 2 Answers ]

I have a Worcester 35 CDi boiler. Recently the shower in the ensuite and the shower in the bathroom won't fire the boiler when turned on. If the heating is on, the showers work but not on their own. The hot water in each sink and the bath works and if you take the head of the showers, the water...

How long should a boiler fire [ 4 Answers ]

We have a group home with a 8+ year old Lochinvar 300,000 BTU LP gas outdoor furnace. I suspect that the installer just shot from the hip on size (retrofit for ceiling electric). It is supplying 4 zones 60 to 100 feet away in the attic with 18"x24" heat exchangers (if memory serves). These are...

Boiler won't fire up [ 1 Answers ]

I have a very old boiler that heats the home with the water in cast iron pipes in the floor - concrete slab. I recently added a second floor with a forced air furnace. I started up the new furnace and now the boiler won't fire. Pilot light is still on. I turned off the furnace and the gas line...

View more questions Search