changed central heating programmer - now some rads dont work

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I replaced an old landis and gyr programmer with a siemens rwb29 - no problem. Now one bedroom radiator is cold, altho pipe to it is hot, and one downstairs rad is tepid.
I wasn't sure which position to put the dipswitch on the back regarding gravity/pumped. I've now tried both positions, but it doesn't make a difference. Any ideas, please folks?
 
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Yes - I know that, but I don't know which my system is (is there an easy way for an absolute novice to tell?). I've tried both positions and it hasn't altered the problem with the rads.
 
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Fully pumped should have 2 pipes from the boiler with motorised valves controlling flow to heating and hot water cylinder. Gravity should have 4 pipes. (2x28mm to cylinder, 2x22mm to heating which is pumped.)
 
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TBH changing the programmer shouldnt affect the rads. If most are working ok, then its a circulation issue. Switch system off and bleed rad. If air comes out, might be issue solved. If not then a balance may be needed to force the water to the 'lazy' rads. See FAQ's for balancing info.
 
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