HOT WATER PROBLEM

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HOT WATER PROBLEM

Post  seandev on Sat Jan 01, 2011 11:43 am

Hi all new to this forum well here goes the problem, just moved house recently and decided to run a bath great water running out at a nice hot temp however when the bath was approx Qtr full the water went cold. Also when taking a shower the water runs out before end of shower, i have a Boilermate 2000 put in a Wimpey house from new, house was built in 2001. Having now checked the servicing instructions using SW 2 on DHW T3 i am getting a HEr sensor error therefore i take it that i need to replace the DHW sensor and all my problems will be solved "i wish". Can anyone please help?.

Sean Plymouth.

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Re: HOT WATER PROBLEM

Post  mike on Sun Jan 02, 2011 10:46 am

Hi
Is the water hard where you live?
If so could also need new PHE or de scaling.
As unit is nearly 10 years old.
Mike

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Re: HOT WATER PROBLEM

Post  seandev on Sun Jan 02, 2011 10:56 am

Hi Mike,
Thanks for your reply no mate i live in Devon and the water is soft in this area so what do you think will i get away with just the DHW sensor.

Sean.


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Re: HOT WATER PROBLEM

Post  mike on Sun Jan 02, 2011 11:00 am

Checked the pump?
Also try running the water till hot then bending / flexing the dhw sensor cable or try tapping it gently.
Sometimes this can help to confirm if intermittent.

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Re: HOT WATER PROBLEM

Post  seandev on Sun Jan 02, 2011 11:30 am

Mike, have checked the sensor cable by tapping and flexing no change still HEr reading how do i check the pump with a screwdriver and ear? And is it the right hand pump i should be checking ie DHW primary (plate heat exchanger pump) No 2 on tech data in manual.

Sean.

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Re: HOT WATER PROBLEM

Post  mike on Sun Jan 02, 2011 11:51 am

Its the DHW sensor
I take the LED display is showing a display?
To check the pump take big screw out on front and insert little finger gently.
Don't worry you can stop the pump with your finger.
If its not working with a hot tap running
Check to see if there is a supply to the pump.
I usually use thin test leads for this.
And either a volt test or meter.
Mike.
Get a sensor and you will be sorted 80% sure of that.
Sometime best to fit new PHE sensor too.
As both the same age.

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Re: HOT WATER PROBLEM

Post  seandev on Sun Jan 02, 2011 12:19 pm

Ok Mike hear what your saying sounds like good advice, i will order 2 new sensors both PHE and DHW from Keeptheheaton.com not great at this sort of stuff being a Military man for the last 30yrs and having most things like this done for me. Having read through this forum think i could change the DHW sensor myself not sure about the PHW sensor mind. Has for changing a pump no chance are there any known Gledhill engineers i could use in my area Plymouth Devon?. Just noticed that there is no Led display ie bar 3 for HW when hot water is running. Also ref the pump screw can i take it out with mains water still on will any water come out of it?

Sean.

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Re: HOT WATER PROBLEM

Post  mike on Sun Jan 02, 2011 12:54 pm

Just change the sensors
DHW turn water off, undo, apply ptfe tape and put in. Connect like for like.

PHE sensor see what colour it is White or Grey cable.
Get the right colour as the white don't always fit the hole if it is a grey one.
The PHE sensor just push in (dry)
DHW are wet
If the sensor is gone then you will have no pump working!
On this site home page are guys advertising for different parts of the uk.
Go through them number 2 on home page list.
I would say pump is ok.

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Re: HOT WATER PROBLEM

Post  seandev on Sun Jan 02, 2011 1:18 pm

Mike thanks might sound stupid here however here goes turn the water off you mean at the main stopcock downstairs or the cock within the boilermate.

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Re: HOT WATER PROBLEM

Post  mike on Sun Jan 02, 2011 1:22 pm

Downstairs
Turn off unit
Open hot taps
Put towel over pump to catch small amount if any water

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Re: HOT WATER PROBLEM

Post  seandev on Sun Jan 02, 2011 1:30 pm

Ok Mike your a star been great help will order the 2 sensors now and follow what you have said ie replace DHW sensor and take it from there.

Sean

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Re: HOT WATER PROBLEM

Post  seandev on Mon Jan 10, 2011 2:41 am

Hi Mike,

Have followed your advice and replaced the DHW Sensor and this seems to have sorted the problem. When i removed the old one i noticed that there was scaling ie: a build up of calcium on the sensor tip. Allthough i do not live in a Hard Water area makes me wonder how my PHE is inside the unit is now 10 years old.

Sean

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Re: HOT WATER PROBLEM

Post  mike on Mon Jan 10, 2011 3:31 am

The tip has been in there a long time.
They are normally scaled up a bit.
If your PHE is scaled up that bad you would know.
Mike

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Re: HOT WATER PROBLEM

Post  seandev on Mon Jan 10, 2011 3:54 am

Ok Mike thanks again feel more confident now have completed this this job and after reading this forum i now understand how this system works.

Sean.

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