Hi,
Our central heating and hot water have both failed today. However the pump is always on. Here's a description of the system:
Fully sealed with expansion tank.
Two zone valves
RF room thermostat with receiver next to hot water cylinder
Here's what I've tried:
Make sure there is no demand for CH or HW...pump is still running, all pipes are cold.
Switch off system at fuse, pump stops
Switch on system at fuse, pump starts even though there is still no demand for CH or HW.
Set programmer to request HW (but not CH), zone valve makes whirring noise (presumably motor), zone valve clicks (presumably microswitches). Check boiler - neon indicator says there is no demand.
Set programmer to request CH (but not HW), both zone valves make whirring noise, both zone valves click. Wait for RF room 'stat to request heat, green LED illuminates on receiver. Check boiler - neon indicator says there is no demand.
Repeat steps above with programmer set to request both CH and HW. Same result.
It also sounds as if there is no water being pushed around the radiators.
I've tried wiggling the levers on both of the zone valves and that does nothing either.
Any ideas please? Thanks.
Our central heating and hot water have both failed today. However the pump is always on. Here's a description of the system:
Fully sealed with expansion tank.
Two zone valves
RF room thermostat with receiver next to hot water cylinder
Here's what I've tried:
Make sure there is no demand for CH or HW...pump is still running, all pipes are cold.
Switch off system at fuse, pump stops
Switch on system at fuse, pump starts even though there is still no demand for CH or HW.
Set programmer to request HW (but not CH), zone valve makes whirring noise (presumably motor), zone valve clicks (presumably microswitches). Check boiler - neon indicator says there is no demand.
Set programmer to request CH (but not HW), both zone valves make whirring noise, both zone valves click. Wait for RF room 'stat to request heat, green LED illuminates on receiver. Check boiler - neon indicator says there is no demand.
Repeat steps above with programmer set to request both CH and HW. Same result.
It also sounds as if there is no water being pushed around the radiators.
I've tried wiggling the levers on both of the zone valves and that does nothing either.
Any ideas please? Thanks.