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Mend Grundfos 1550 Home Heating Systems

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heating is erratic sometimes on then goes off fitter says system is overhea?

fitter seems to think system is overheating due to eitherpump grundfos1550 or programmer honeywell st699 being at fault ,any suggestions would be helpfull before i have to buy one or the other

alan
November 2011
GrundfosGrundfos 1550Heating, Home Heating Systems
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Grundfos 15-60Grundfos 1550 chGrundfos 28i JuniorGrundfos 96437234Grundfos Alpha+ 25-60Grundfos CEIP65Grundfos MK 2 15/50Grundfos SD623Grundfos Selectric 1550Grundfos UP 15-50Grundfos UPS 15/50x18Grundfos UPS15-50

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