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Ideal Logic H18 Cycling

B

bm1289

Joined
13 Dec 2010
Messages
2
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Location
Lanarkshire
Country
United Kingdom
Our Ideal Logic H18 constantly cycles every 5/10 mins during the night with no heating or hot water demand from our Danfoss TP1 programmer. Originally thought the boiler was dry cycling however thinking the cylinder stat could be kicking the boiler in and out despite the programmer not calling for hot water. Any ideas?
Noticed the fan coming on also at times however no demand or boiler going into ignition sequence. Head scratcher!
 
Do you have a frost stat? Could also be a motorised valve/stray voltage.
 
No external frost stat installed plus boiler sitting around 15 degrees so built in frost protect not activated (5 degree). Checked all the supplies/connections in sequence and all functioning properly and sending voltage in sequence from the wiring centre etc. Honestly thinking the PCB however eager to eliminate everything before I spend money for nowt.
 

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