Rheem Power Vent Mod# 21VP50-1P acting strange....
Posted 06 January 2010 - 04:15 AM
During the call for heat from the thermostat, the glow plug came on and then the gas valve would open shortly thereafter to ingite the flame. The flame would burn for about 30 seconds or so and then suddenly stop with a click (I think the gas valve closed). Then almost as soon as the flame went out, the glow plug would come back on and then and with another click from the gas valve the flame would reignite. This cycle continued until the thermostat stopped calling for heat.
The unit is still making hot water (thankfully) but I'm fearful that the over cycling will cause a premature failure of control components. I had to replace the gas valve about 2 years ago and replaced the control module last October.
I suspect there is a temperature sencor somewhere that needs replaced.... any help or information would be appreciated.
Posted 12 March 2010 - 06:45 AM
If that doesn't do the trick, then replace the thermocouple (first), then the flame sensor (second, if the thermocouple repl didnt't solve the problem).
Applianceman has an excellent video demonstrating this in the HVAC forum and here's the link--http://applianceguru...um13/22527.html
Good luck. If you still have the same symptoms after doing this than the next step is to look at the draft inducer system and its vacuum/end switch(es). The good news is that you've already replaced the most expensive parts of your heater, so everything should be gravy from this point.
Posted 12 March 2010 - 06:50 AM
As it turned out, I ended up replacing the glow plug. It turns out that this unit doubles as a hot surface igniter as well as a flame sensor. Once it was replaced the unit works as normal!
Posted 12 March 2010 - 07:25 AM
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