Boiler Heater Problem

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  #1  
Old 11-17-02, 06:50 AM
Simon Luce
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Question Thorn EMI Apollo Bolier trouble

Hi

I have a Thorn EMI Apollo gas boiler (about 12 years old) which works fine most of the time. Now and then the pump stops after about an hour's heating, but the boiler still continues to burn causing the water in side to boil and make banging noises.

Has any one come across the same problem, I suspect the pump overrun thermostat is faulty.

Here are a few clues that may help :-

When the C/H required, it will run for hours without any probelms.

If the H/W needs to be heated and takes more than half an hour, there's a very good chance the problem will occur.

My neighbour has the same set up and gets the same problem.

Thanks in advance to anyone who can help.
 
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  #2  
Old 11-17-02, 07:28 AM
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Simon Luce:
Your boiler water temperature may be set too high or the thermostat is defective. You could start with a setting of about 160 deg F. You can use a stem type thermometer taped to the hw supply line to verify the boiler's thermometer.
 
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Old 11-17-02, 07:37 AM
Simon Luce
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Hi GregH

The boiler has two heat settings on its thermostat, its currently on the low setting.
 
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Old 11-17-02, 09:21 AM
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Simon Luce:

GregH wrote:
"You can use a stem type thermometer taped to the hw supply line to verify the boiler's thermometer."

Regardless of the setting, the thermostat could be way out of calibration.
Get a thermometer and check the temp.

Search back several posts, there is a ton of information on checking and setting up a boiler.

Come-on back if you don't get it.
 
  #5  
Old 11-25-02, 01:40 PM
Simon Luce
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I've replaced the Hi / Low and pump overrun thermostats, there was no way of recalibrating. Everything seems to be running ok now. I suspect the pump overrun stat was faulty, the old one was very corroded and must have been losing contact thus disconnecting the supply to the pump even though the gas burner was still alight.

Thanks for the advice.
 
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