typical reasons for hot crossing into the cold?

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typical reasons for hot crossing into the cold?
Author: waukeshaplumbing (WI) I have a service call today and the homeowner is having issues with the cold water being hot in the past its been a toilet mixing valve....I don't think this house has one what else could cause this cross over? thanks!
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Re: typical reasons for hot crossing into the cold?
Author: Paul48 (CT) Check valve in a recirc. Bad single handle cartridge. Bad thermostatic mixing valve.
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Re: typical reasons for hot crossing into the cold?
Author: waukeshaplumbing (WI) this is a verrry basic house no recirc no thermostatic mixing valve can a tub/shower cartridge flow hot through the cold without it being turned on? Edited 1 times.
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Re: typical reasons for hot crossing into the cold?
Author: sozoal (CA) yes, if its a single cartridge.
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Re: typical reasons for hot crossing into the cold?
Author: Paul48 (CT) Sure.....Get behind the escucheon...run the water in the basin, and you should feel the cold side get noticably warmer if it's crossing there.
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Re: typical reasons for hot crossing into the cold?
Author: hj (AZ) Yes, the most common valves it occurs with are Mixet and Moen. If it is a Mixet, it is almost impossible to cure it, unless you buy the aftermarket "Nomix' cartridge, which converts it to a Moen style unit.
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Re: typical reasons for hot crossing into the cold?
Author: waukeshaplumbing (WI) so any single handle faucet or tub/shower mixing valve could be the culprit? its a simple 1 bath house....so it should be easy thanks
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Re: typical reasons for hot crossing into the cold?
Author: hj (AZ) NO, only certain types CAN cause it. Delta and Kohler, for example, cannot cause it.
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Thanks
Author: waukeshaplumbing (WI) thanks.ill look for a Moen or off brand...the job is Monday Edited 1 times.
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Re: Thanks
Author: waukeshaplumbing (WI) she had a handheld on her laundry tub faucet...she left the faucet ON, w/ the sprayer off....1 minute fix-----please pay me!
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