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home Fix label Heating label_important Home Heating Systems category Saunier Duval

saunier duval Thelia 23e 12 yrs old?

Hot water runs for approx 15 sec's before running cold for about 5 sec's and then repeats hot and cold.
When heating first fires up on morning, loud clicking is herd at set Temp for approx 10 sec's, goes off if higher Temp is set.
HELP!!!
Brian Smith, March 2008
home Fix label Heating label_important Home Heating Systems category Saunier Duvaldone
Pump ok!
Changed DHW Thermistor, still same.
Could it be diverter valve?
thanks.

Brian Smith, March 2008
Possible pump not running Remove knob on pump front and push in with thumb. This will confirm running. If not push in with screwdriver and spin clockwise. If it runs change capacitor, if not change pump.

bendan, March 2008
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