worcester 350 combi

[stecorcoran83]

hi all dont know if any1 can help me the dhw keeps running hot and then goes cold and then goes hot again, i think it might be the diverter valve but not sure???

 

[GreenArmy]

Flow switch?

 

[Billy Bob Bob]

try a thermistor easy to change on the 350 its in front of you just above the pcb houseing

 

[freelander100]

no divertor on 350, sounds like blocked plate heat ex. does boiler go off then come back on.

 

[Billy Bob Bob]

no divertor on 350, sounds like blocked plate heat ex. does boiler go off then come back on.

could be a plate heat but a thermistor will also cause this

 

[freelander100]

change both dhw thermistor and primary, but if boiler cuts out on dhw demand i think you will find the plate blocked, cheat reduce max gas rate on hot water to 8.5 mbar, this should work