Question about Bosch & Tankless LP Hot Water Heater

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Pilot light won't stay on, and water not being heated. Is it because of the magnetic valve not staying open allowing gas to flow through?

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  • choppasmith Dec 29, 2010

    Hi Dan

    Firslty thanks for your reply.

    I should have been more specific with my problem. I have an old NG Bosch TF 400 1TR (I think) . When I press the ignition button for the pilot I get gas coming through.When I de press the button the gas shuts off. I noticed there. is a magentic valve that sits in behind the ignition button. I assume this valve should stay open when in use. Is this what it is supposed to do? Is there a way I can check that the valve is faulty and not the thermo connection lead or the temp cut out switch.?

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Hi

could be gas valve. check that the fan and pump run.if not could be an air flow switch.

hopes this guides you the wright way

Posted on Dec 29, 2010

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Problem is not thermocouple:
Thermocouple should be finger-tight plus 1/4 turn
Overtightening will short thermocouple against gas control valve, and solenoid switch will not open, and no gas will reach pilot once red button is released.
Tip of thermocouple has to sit in the pilot flame.
If pilot flame will stay on, then thermocouple is good.

Problem is not solenoid switch.
The gas control valve solenoid opens and closes gas supply to gas control valve.
On mechanical gas control valve, when you push down the red button to light pilot, then you are opening the solenoid and letting gas flow into gas control valve.
When heat is applied to thermocouple, a small electric current travels to gas control valve, and this causes solenoid to stay open.
If you extinguish pilot, then no current travels to gas control, and solenoid clicks off.
You can hear it click, and this is how you test it.
However, since you are getting gas to pilot light, then the solenoid is not the problem.

This leaves 4 possible problems:
1) Bad gas control valve thermostat.
http://waterheatertimer.org/pdf/How-to-replace-water-heater-gas-valve.pdf
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http://waterheatertimer.org/How-to-repair-Rheem-TRD.html
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If pilot stay lit, then thermocouple is working.
If pilot will light, then you have gas. If pilot goes out when pilot button is released, then thermocouple is next suspect.

Thermocouple tip must sit in pilot flame.
The pilot light heat applied to two different metals inside thermocouple causes small current.
The current travels back to gas control valve through copper line.
If the gas valve receive this current, then a magnetic switch stays open and allows gas into the gas control valve.
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If the gas control valve does not receive the current, then the magnetic switch does not stay open when you release the red button.
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Make sure thermocouple tip is seated inside the burner flame.
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Once hot water is gone, then pilot light has to be lit again.

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