Hi, I have a BAXI 105e Combi boiler in the house I have just brought, it was installed in 2006. I have noticed a problem with the hot water upstairs, with the shower and bathroom taps. It runs hot for abit then freezing cold, then back to hot in a constant cycle. However, there doesnt seem to be a problem with the taps downstairs, in the kitchen. The boiler is located downstairs in the garage. I have no Idea of the state of insulation of the pipes, but this wouldn’t explain for the sudden drop in temperature? Also the central heating works fine and the problem in there with or without the central heating on. Any suggestions? Many Thanks.
Lawrence

Lawrence, April 2012

baxi [instant?] 105e combi
GCN 47-075-??
downstairs taps DHW OK
upstairs taps intermittant DHW
shower probably has thermostatic mixing valve on it
stops DHW temperature rising above 50 degrees
causes boiler to overheat & cut out because it cant dissapate heat generated

manwithnoname, April 2012