Ideal system icos--no display on user control

jimbo.911 · 23 Aug 2006

Could be a simple one just dont know:

We have an ideal system, icos theres power to the boiler and the red switch light is on. There is no led indication on the user control panel. no 0 or any fault code indicator. Tried reset but its still playing dead. Any ideas?

Jamie

scatmanjohn · 23 Aug 2006

jimbo.911 said:
Could be a simple one just dont know:

We have an ideal system, icos theres power to the boiler and the red switch light is on. There is no led indication on the user control panel. no 0 or any fault code indicator. Tried reset but its still playing dead. Any ideas?

Jamie

Does the boiler work ok apart from that?

jimbo.911 · 23 Aug 2006

No the boiler is totally dead except the light on the main power switch. The room thermostat is "on" and the timer is on for both CH and HW. There is no fan or anything.

Hope this helps

Jamie

corgiman · 23 Aug 2006

you need a new main printed circuit board

sorry

jimbo.911 · 23 Aug 2006

I thought it would be given its totally dead...

Agile · 23 Aug 2006

Not necessarily!

Thats a common fault caused by a water leak from the AAV or similar piping at the right.

It leaks onto the display PCB and faults the connection interface PCB.

It may, or it may not have damaged the main PCB as well.

Quite an expensive repair if both have failed! Might be better to reconsider if a more reliable boiler would be a better solution!

There are two different PCBs depending on age of the unit. Links have to be selected to set the main PCB to the type of boiler.

Tony Glazier

scatmanjohn · 23 Aug 2006

$$$$$$$$

corgiman · 23 Aug 2006

Agile said:
Not necessarily!

Thats a common fault caused by a water leak from the AAV or similar piping at the right.

It leaks onto the display PCB and faults the connection interface PCB.

It may, or it may not have damaged the main PCB as well.

Quite an expensive repair if both have failed! Might be better to reconsider if a more reliable boiler would be a better solution!

There are two different PCBs depending on age of the unit. Links have to be selected to set the main PCB to the type of boiler.

Tony Glazier

must say tomy I have come across this loads (its a git getting the primary flue seal water tight really fiddly) and have never seen an instance when the PCB has survived

How can it???? Its it just the facia plug that dies, if so how do you repair it??

Agile · 24 Aug 2006

The connection to the display pcb is four wires, two dc supply and two data. The usual cause of failure is electrolysis of the pcb tracks causing loss of pcb track and loss of connection to the display pcb ( which usually survives ).

At the same time the current load on the dc supply sourced from the main pcb is increased above normal. Due to poor design ( or perhaps intentionally to escalate failure and increase sales of spare parts ???? ) the main PCB also fails because it contains no inbult protection against overcurrent on that dc supply rail.

Its interesting that we never get anyone involved in boiler pcb design commenting here. The nearest I have got is the ex-manager of the plant that made the Puma pcbs and he appeared to be unaware of the very poor reliability or the fact that the holes in the substrate were too large to hold the pins firmly. As he had retired he would have had no axe to grind. Manufacture has now been transferred to..... Poland !!!

Tony

Gasguru · 25 Aug 2006

Still on poor quality, anyone having problems with Honeywell mid position valves?

The valves used to employ standard size microswitches but Honeywell have cut costs and now use minature microswitches.

The customers Y plan system was playing up. It turned out to be the NC contacts on SW1 had gone open circuit. The switches are Taiwanese in origin.

I then spent an hour fettling the spindle on the ball and plate as it appeared to be out of tolerance and would not fit the new actuator head.

The actuator had only lasted 2 years before failing. We know Honeywell boards are poorly designed and manufactured but at least you could rely on their valves - it appears not to be the case anymore.

ChrisR · 25 Aug 2006

There are some "chinese copies" of Honeywell valves about which look absolutely identical externally - haven't got one of those have you?

Gasguru · 25 Aug 2006

The new actuator looked identical - both had the Hanson sychron motor.

I think Honeywell are just cutting costs, afterall they must have noticed a massive downturn in the sale of zone valves now that combis account for 60% of boiler sales and very few combis use Honeywell valves now.

And in Europe where valves such as Orkli (very low cost but 2 year warranty) are more popular it must be imposible for them to compete.

corgiman · 25 Aug 2006

ChrisR said:
There are some "chinese copies" of Honeywell valves about which look absolutely identical externally - haven't got one of those have you?

Sheesh I have had to change loads of the em chris they are rubbish

they make the boiler go CLUNK when it changes from HW to CH mode

piece of shat the lot of em

diynot

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Ideal system icos--no display on user control

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