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Boiler cycling when system up to temperature

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hallra

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111
Hello,

can anyone explain what causes a Honeywell Ultracom 24hxi that works as expected when the system is cold, but when the system gets up to temperature the boiler starts to constantly cycle and fire quickly every 30 seconds or so.

- When the system is cold the boiler will fire for a period of time, then there is a long pause as the hot water is flowing around the system.

Has some sensor broken or something, I’ve had a plumber service the boiler without finding an issue...
 

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