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Gaztech, HVAC Technician
Category: HVAC
Satisfied Customers: 465
Experience:  Owner at Gaztech
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I have a Rheem Power Vent 40 gal hwh Model 21VP40-1P

Customer Question

I have a Rheem Power Vent 40 gal hwh Model 21VP40-1P installed in 1996. It will start up with vent motor running but will not send a signal to send power to the hot surface ignitor or turn the valve on. Can you suggest how I can test what is wrong?
Submitted: 1 year ago.
Category: HVAC
Expert:  Gaztech replied 1 year ago.

Hello, here to assist you,

unplug you hot surface Check for 120v after fan goes on,

If you do, replace hot surface, if you dont, fan pressure switch is not closing

Expert:  Gaztech replied 1 year ago.

Hope this was helpful

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Expert:  Gaztech replied 1 year ago.


Expert:  Gaztech replied 1 year ago.

If you need to replace any parts, I suggest that it is time to replace the whole tank as it is seriously outdated and may start leaking and do serious damage to you building.

Customer: replied 1 year ago.
Hi. I did the tests. Found no power to hot surface terminals so replaced vacuum switch. It is working but still not getting 120v to terminals. What else can I check. I also removed blower fan, cleaned fan, tubing and vent. I am not getting the clicking sound after I turn the power on. Is that what turns the power on to the hot surface unit? I checked vacuum terminals and get continuity when power is turned on and not when blower is not running.
Expert:  Gaztech replied 1 year ago.

When the pressure switch closes it sends 24v to gas valve ignition control, to start hot surface ignitor, if it does not, internal relay or electronic board in gas valve is defective and will need replacement.

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