linea 24 04 error pump or pcb?

Joined
9 Sep 2006
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Location
Newcastle upon Tyne
Country
United Kingdom
Keep getting 04 code on linea 24 drained pump from car tyre type nipple then repressurised exp. vessel (a tiny amount of water came out when i pressed valve,before i re filled,now just air comes out) to 12 psi but when i switch on it comes on for a second or two light green then turns red with 04 code flashing when i put hot tap on it feels like the pump is on but nothing else if i the selector switch on hot water only with taps off the pump gets hot any ideas out there?
 
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Some of the Lineas have a low pressure switch which could be blocked so the boiler thinks there ks no water in it.

Try cleaning it out.
 

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