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Any Experience Of Henry?


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Towards the end of last year, my Carver Cascade 2 failed to stay on a few times when on gas. It appeared to have failed to relight itself during its normal cycling (controlled by the thermostat), and it shut itself down with the red light on. I've checked all the connections and made sure the burner and electrode are clean. I'm not going to condemn it just yet, as it worked most of the time but if it carries on being unreliable I might have to get a new module, or get mine repaired.

So I was wondering if anyone had any experience of the "Henry Burner Module" I found in

 

http://www. caravanparts. net/ (then click on "water heater")

 

It claims "this unit relies on 21st century electronics".

 

Thanks in advance.

 

Jeff

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Towards the end of last year, my Carver Cascade 2 failed to stay on a few times when on gas. It appeared to have failed to relight itself during its normal cycling (controlled by the thermostat), and it shut itself down with the red light on. I've checked all the connections and made sure the burner and electrode are clean. I'm not going to condemn it just yet, as it worked most of the time but if it carries on being unreliable I might have to get a new module, or get mine repaired.

So I was wondering if anyone had any experience of the "Henry Burner Module" I found in

 

http://www. caravanparts. net/  (then click on "water heater")

 

It claims "this unit relies on 21st century electronics".

 

Thanks in advance.

 

Jeff

10729[/snapback]

 

Talk to Gary at Arc Systems - he is the man!

 

Mike

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Thank you Mike!,

To start you do not need a complete heater, at a guess yours is 1995/6 unit which do suffer from this problem and the burner module would be all that is required.

I can offer a serviced exchange unit at considerable saving on new, or if you like the 21st century burner module you speak about, having had a major role in it's design and purchased though me. ..I know it is good :rolleyes:

I cannot however speak for the whole heater.

gary1s.gif

 

Arc Systems are specialist Carver caravan product repairers, committed to providing a comprehensive service as well as spare parts for these popular heaters.

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Thanks Gary

 

It is an early late (!??) unit dated Jan 1993 with the four wires leading off to the solenoid and thermistor. As I stated above, it has only played up a few times, but I don't expect it will fix itself, so I will have to do something if it gets worse.

The module has already been repaired 2 or 3 years ago by replacing the two op-amps (they are now mounted on sockets for easy replacement) and worked fine until late last year. I replaced the chips after the first time it failed to stay on and checked that the burner had a good ground from the star washer under the brass nut, but it happened again after that.

Therefore with such a slight intermittent problem, I think a new style module would give more peace of mind, bearing in mind its now about 20 years since the original gas module was designed, and electronics have come a long way since.

Would I be right in thinking that we are looking at a bit over £100 for such a module?

 

Thanks

 

Jeff

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First of all I would get rid of the sockets. .more trouble than their worth, secondly direct mounted chips have nothing to do with this fault it's a bad connection on the other side of the board???

The strange thing is the date you give is wrong for the PCB you describe. ..yours came out much later in 93 to replace a short lived board with one op-amp and a CMOS chip because the CMOS was prone to failure, the two op-amps are generally rock solid. .very rare I change one. Late 93/94 must have been very good years because I have very few in for repair, then it quickly goes downhill :):)

Anyway it seems you have a 'molex' flat four wire connection and a press button switch? so the new module is a direct easy replacement and less than you imagine

gary1s.gif

 

Arc Systems are specialist Carver caravan product repairers, committed to providing a comprehensive service as well as spare parts for these popular heaters.

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Hi Gary

 

I bought the caravan new in May 1993, so the heater must pre-date that.

The burner is stamped 01 93 and the seal has 26 Mar 1993 printed on it. The chips are both LM324. The board has W817215 printed on it.

((I have seen an earlier module from Feb 92 which did have one 4011 cmos chip and an adjustable mechanical thermostat, but mine is different and has 2 x LM324 and a thermistor.))

 

Thanks for the comment about the sockets - yes they are an extra source of potential trouble, and now I know the chips are both ok, I'll ditch the sockets. The control panel does not have a push button. It has a slide switch, two fuses and three LEDs.

 

The connectors are not Molex. Both ends of the lead are 5 pin din and the sockets are 7 pin.

 

As I don't have any Molex plugs, and your reply implies that the Henry module does have Molex plugs, does this mean that the Henry module won't fit my Din lead?

 

Thanks again

 

Jeff

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Not that it matters but it was the earth wire to the burner that confused me. ..yours should be earthed on top of the gas valve and in fact it was sometime in mid 94 and not 93 when the earth moved to the burner. ..I just wonder what else has been changed?. The most probable cause is a component which was passed it's sell by date when it was fitted!? and now causing a bad joint. This is letting go when the PCB gets warm under the tank after the first cycle, but it's not strictly speaking a dry joint. Although the gas valve opens for the reheat cycle. ..there is no spark to light it so it fails. Things are made worse by a component to the right of it that is designed to get hot?? ;)

gary1s.gif

 

Arc Systems are specialist Carver caravan product repairers, committed to providing a comprehensive service as well as spare parts for these popular heaters.

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  • 2 weeks later...

Thanks Gary

 

Sorry about the delay in replying, but my student daughter quite often takes the laptop away.

What I think I'll do next is rig up the burner module to a temporary gas supply (I will be careful) and run it on the bench (in the garden), and try to see why it won't stay on. Just one thing I've remembered is that it sparks about once or twice per second even when the thing is alight. I'm beginning to think that it is not seeing enough current through the flame, but my bench test will prove this one way or another.

Just one point, will the Henry module fit the 5 pin Din connectors on my leads?

 

Jeff

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Just one point, will the Henry module fit the 5 pin Din connectors on my leads?

Jeff

14553[/snapback]

 

 

It will not and it will not work with the later Carver press button switch either, in fact it will kill it instantly.

No it comes supplied with a control switch of it's own and in your case you will need a patch lead to connect the two and a 'Patrice' box to mount the switch in/on.

gary1s.gif

 

Arc Systems are specialist Carver caravan product repairers, committed to providing a comprehensive service as well as spare parts for these popular heaters.

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It will not and it will not work with the later Carver press button switch either, in fact it will kill it instantly.

No it comes supplied with a control switch of it's own and in your case you will need a patch lead to connect the two and a 'Patrice' box to mount the switch in/on.

15353[/snapback]

 

Gary I think you mean 'patress box'. Bob has some in stock.

 

Mike

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Gary  I think you mean 'patress box'.  Bob has some in stock.

 

Mike

15380[/snapback]

 

Don't care how you pronounce it in Yorkshire

gary1s.gif

 

Arc Systems are specialist Carver caravan product repairers, committed to providing a comprehensive service as well as spare parts for these popular heaters.

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