Glow Worm Hideaway 90 tripping RCD

[OJ]

Hi - I have a GLOW WORM HIDEAWAY 90 BOILER (G.C No. 41-313-84), which has started tripping my sockets RCD.

Dare I say, it used to all work fine, and nothing new has been done to it.

Any thoughts would be gratefully received....

OJ

 

[45yearsagasman]

Are you sure it's the boiler at fault and not some other system control?

 

[OJ]

Hi - all I know, is that I unplugged ALL appliances (kettle TV, washing machine, etc), in order to identify the cause, and the RCD now only trips whenever I switch on the fused spur for the boiler......

 

[45yearsagasman]

Hi - all I know, is that I unplugged ALL appliances (kettle TV, washing machine, etc), in order to identify the cause, and the RCD now only trips whenever I switch on the fused spur for the boiler......

You need to describe the type of system controls you have and if it's fully pumped or not eg are there motorised valves and pump in airing cupboard.Try running the system but turn the boiler thermostat to off and that will help to eliminate the boiler controls.I doubt if it's the boiler controls.May be damaged boiler wiring.Is that an open flued boiler? If so I would get it checked out professionally.

 

[OJ]

Hi - I'm afraid I don't know enough in order to answer your questions. I have no airing cupboard, since the HWC was moved up into the attic. I turned the stat on the boiler to zero/off, and switched on the fused spur point - and it still tripped the RCD....

Any ideas?

 

[bhm1712]

since the fused spur energises the entire heating system and not just the boiler, as said already, its probably another component which is causing the trip and not the boiler.

most common causes -

Pump down to earth

motorised valve stem leaking into head (if you have any MV)

id check the pump first.

 

[OJ]

Many thanks for your advice.

So should I call in a boiler engineer, or an electrician?

 

[OJ]

since the fused spur energises the entire heating system and not just the boiler, as said already, its probably another component which is causing the trip and not the boiler.

most common causes -

Pump down to earth

motorised valve stem leaking into head (if you have any MV)

id check the pump first.

Hi - re checking the pump, could you elaborate please?

 

[OJ]

Hi - I have opened up the boxed-in section beside the boiler, to discover (what looks like) a red Grundfos Selectric Pump, and 2 electric switch units..?

Either side of the pump, are corroded/green shut off valves - one of which is weeping - could the moisture be getting on the wiring? And if so, is this where my problem lies?

 

[45yearsagasman]

Still don't know exactly what type of system you have but the pump would be the most likely cause. You must isolate system controls in turn to ID the faulty component,a process of elimination.

 

[OJ]

Still don't know exactly what type of system you have but the pump would be the most likely cause. You must isolate system controls in turn to ID the faulty component,a process of elimination.

Are you able to elaborate, please?

 

[londonboy]

1. Turn heating and water off from your timer.

2. Turn on spur.

3. Turn on hot water.
(see if it trips)

4. Turn on heating
(see if it trips)

You need a heating engineer who is competent with electricity too

 

[OJ]

1. Turn heating and water off from your timer.

2. Turn on spur.

3. Turn on hot water.
(see if it trips)

4. Turn on heating
(see if it trips)

You need a heating engineer who is competent with electricity too

Hi - I'm afraid I can't even do 1 - when the spur is off, the timer is off. And when the spur is turned on, it trips the RCD!

 

[Agile]

I dont know why you are waiting. Its pretty obvious that you dont have the knowledge or skill to repair it yourself.

In that case you will need to call a competent heating engineer. One who is competent in all aspects of the work will be able to deal with electrical aspects and would usualyl have a clamp meter for measuring 1 mA upwards of earth leakage.

Tony

 

[londonboy]

I dont know why you are waiting. Its pretty obvious that you dont have the knowledge or skill to repair it yourself.

In that case you will need to call a competent heating engineer. One who is competent in all aspects of the work will be able to deal with electrical aspects and would usualyl have a clamp meter for measuring 1 mA upwards of earth leakage.

Tony

Tony is it common for heating engineers to carry insulation resistance testers for testing immersion elements/pumps etc?