Hot water from cold side


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Old 12-19-14, 10:19 PM
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Hot water from cold side

Husband replaced a sink in our bathroom & put the original faucet back on the new sink (a normal two handled Kohler faucet). Ever since then, when we first turn on the water on the cold water side, most of the time (but not every time) hot water comes out of the cold water side until it runs for a while; after that, normal cold water comes out again. Also, sometimes the faucet for the tub in that bathroom seems to have variable temperature while running (hotter, colder, hotter). All the other sinks etc. are normal. Any ideas about what might have happened and what to do to fix it? Thanks!
 
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Old 12-20-14, 06:44 AM
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Faucet: I have seen that happen when the hot and cold water lines are right next to each other. Heat from the hot water line is transferred to the cold so you get a slug of warm water until it's flushed out of the pipe. It can be particularly bad if you have a recirculating hot water system since the hot water pipes are always hot.

Tub: First I suspect the balancing or anti scald valve in the faucet. I have also seen variable water temps with a tankless water heater as it cycles on and off when hot water is being used.
 
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Old 12-20-14, 10:37 AM
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Thank you.

For the faucet, how would we fix it? It was fine for about 10 years before the replacement of the sink. (The replacement was with the same sink - the original had just developed a crack in it.)
 
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Old 12-20-14, 11:17 AM
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Take a look underneath where the water lines go to the faucet. Are they very close together or touching?
 
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Old 12-20-14, 05:16 PM
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Hi, We know you removed the faucet to install the new sink. You "disturbed" the lines to the faucet and may have broken some debries loose that now may be stuck in the valve seat. shut the water off under the sink then remove both stems and with the faucet covered with a bucket turn the water on and off acouple of times (both sides) to blow the junk out. Wash the stems out then replace and give it a try.
Good Luck woodbutcher
 
 

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