View Full Version : Knocking noise in system
04-17-2012, 02:04 PM
We are looking at a Rheem system, heat pump. When it cycles off it begins a knocking sound after approx 3 min. Goes for 60-90 sec, slows down and then stops. It sounds like metal on metal. We have some ideas but are looking for input.
04-17-2012, 03:25 PM
Need model # and serial # of unit.
where is the noise coming from?
04-18-2012, 07:43 AM
How long is lineset and evap and condenser same elevation?
04-18-2012, 09:00 AM
Same issue last week on a Weather King (Rheem). Knocking was at outdoor TXV after shut down. All operating values were normal. This being an investment property with the owners wanting "the cheapest fix", installed a solenoid valve in the liquid line. Problem was solved.
04-18-2012, 09:22 AM
TXV=$70, Solenoid= $120. Cheaper? Guess less labor on Solenoid.
04-18-2012, 12:44 PM
Rheem knows about it. Likely will need a bleed type TXV put in the outdoor unit. Even then, might not stop it. We're 1 out of 2. I'll ask our tech rep about the solenoid idea.
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