Heater not firing up possible low water cutoff device

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Old 01-18-13, 09:01 PM
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Heater not firing up possible low water cutoff device

Hi, im a novice in heating but i have a williamson -thermoflo gwa and for some reason when i call for heat nothing fires up. i can see the flame on in the burner but nothing will turn on. the lights on my low water gaurd dog rb-24 are not on. usually its green or red but no lights. could it be that i have to replace the gaurd dog because it shorted?


 
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Old 01-18-13, 10:18 PM
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Hi Edward, you may have lost the 24VAC transformer... if you have NO LEDs lit on the Dawg, I would suspect this first.

Does your system have electric zone valves?

If so, can you tell if they open when thermostat calls for heat?
 
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Old 01-18-13, 10:20 PM
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Do you own and know how to use a multimeter?

If so, can you find the 24VAC transformer?

You are sure that the circuit breaker in the panel is not tripped?

And someone did not accidentally turn off the 'emergency switch'?
 
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Old 01-18-13, 11:00 PM
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lol what is a electric zone valve?
i dont have my multimeter with me now but i have a electric pen tester and i think i know which one is the transformer. ill post pics tomorrow of it. i checked the circuit breaker and all of them were open so it might be the transformer
 
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Old 01-19-13, 05:32 PM
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Its working again

Yup, it was the transformer i bought a new one and everything works now. weird how it breaks any reason why it broke?
 
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Old 01-19-13, 09:18 PM
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Very cool... I like a happy (and relatively cheap) ending!

what is a electric zone valve?
If you have more than one thermostat in the home, then you have what we call 'zoned heating'. You will have a number of separate heating zones. ZONE VALVES are motor operated valves that open and close the zones based on 'calls' from the thermostat. They run on 24VAC so if the transformer goes, you are 'dead in the water'.

any reason why it broke?
The do just 'give up their ghost' sometimes for no apparent reason.

Sometimes they are overloaded by an installer using too many zone valves on one transformer. The standard 40 VA transformer can run maybe four valves... it varies from one valve manufacturer to another.

Do you have zone valves (based on description)? Honeywell valves are small silver boxes. Taco valves are green or gold with vent openings.

If so, how many zone valves are on your system?
 
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