Heater will not turn on, it used to fire if you turn thermistat on and gave a little tap to the manifold it would fire right up. now nothing

check small vacuum hose on rear of square inlet manifold top that goes throught firewall ( bulkhead ) is not cracked or has come off
it goes into cab near heater hoses. this is the vacuum supply hose
if you have no vacuum the heater controls default to go to windscreen. also check the black & white plastic little round one way valve for leaks & operation
also check vacuum hose that goes onto heater tap that is in right inner gaurd under brake master cylinder area for leaks and that its on the heater tap valve
if they are all ok check inside do you hear any hissing noises behind dash controls or down at front centre console area?

it sounds like the thermistat was instald back words. are thare is a air bubble thare try berping the sistem the hights heater hose if that dos not help check thermistat once in a blue moon thay do fail

Not sure what you mean specifically. Obviously the heater takes a few seconds to go through pre-checks and will then light. It will then take a few seconds for warm water to reach the tap depending on how far the heater is from the tap. If it is actually taking a while for it to light you need to make sure you turn the tap on full. These heaters need good water flow to fire up. Check for any filters in the tap ware and ensure they are cleaned out. I often take these filters out as they cause nothing but trouble and block too easily.

I think you are working on a RV water heater.
Check the reset on the unit and turn your beakers off and on.
If you are working on a gas water heater is the pilot lit.
If you can get us a little more INFO we can help you better.

Did you back flush the heater core? IOW flush it both directions. Are the hoses getting warm/hot. If so you may have a problem with the blend doors. A very common problem with these vehicles. Involves dash removal.

two things to try first to get you pointed in the right direction. First disconnect the R or RH wire from the T-Stat. If the furnace turns off (Stops firing w/ fan to turn offabout 90 sec. later) then you more than likely have a bad Thermistat. If it continues to run Pull the R wire from the Furnace circuit board. put door back on furnace if it stops you have a short in the wire. Still Running? Most likely a bad curcuit board. Hope this helps.

the 1986 hj60 had the super glow system manifold heater was part of that It was a very good heater system and gave little or no trouble.If you are having trouble ,please tell me what they are and i will tell you what to do

If your dryer runs, but does not heat the following link will explain how to troubleshoot:

http://www.fixya.com/support/r630242-dryer_runs_but_not_heat

The majority of dryer heat related problems are caused by poorly installed, improper, kinked, or clogged ventilation exhaust ducting. Pay particular attention to the section that discusses ventilation. Failure to ensure the dryer is properly ventilated will result in repeated failures of any components you may replace. In addtion, this can become a fire hazard.

If you have any questions, please let me know. I hope you find this information helpful.

Yes that is going to be the contoll valve on that heater. You can probley fix it very easy with the right part. You will need to locate a plumbing supply over there in the UK. Give them the make and model number and tell them you need a unitroll gas valve for it.

intake hose to top