The pilot wont stay lite on the furance i already change the thermcoupler model # is srm-54815b montgomery ward

That is one old heater. If it is electric the top element may be bad, or most probable is the tank is full of sediment which you or may not be able to drain. Personally I would not spend any or time on a old water heater. It sis very inefficient lose heat since the tnpk has minimal insulation which cost you money for more energy to reheat it.

I can't speak to the specific model but with most pilot lights, there is a switch setting or button for lighting. If you release that switch or button too soon, the pilot will not remain light. Hold the switch or button ON while you light the pilot. Keep holding the switch or button for about a minute until the heat sensor is sufficiently warmed that the pilot light stays on. Good luck.

The oriface may be partialy plugged or the thermo-couple is bad.

Possibly a bad thermocouple.

Depending on it's age, it's probably the Thermocouple going bad. Or you may have an insect nest inside the screen housing, around the pilot assembly, that needs to be removed. If you need to replace the thermocouple, I suspect the heater was manufactured for Montgomery Ward by Uniflame or Blue Rhino. Either should fit your heater.

try national energy they are on line

Check and make sure the pilot flame is hitting the thermocoupler.Flame must touch thermocoupler, if the flame is not touching it, you may have to remove and clean pilot orfice to make flame stronger. check this before replacing thermocoupler, good luck.

looking for owners guide for Wards condensing unit # SRM-51254A

You need a very kong wire and a kitchen match. Turn the knob on top to pilot and push down have your flame already down thru the pilot hole at the bottom of the inside of furnace. Hold for a few seconds and release knob trun to heat. This unit works on a power pile systm and generates milivolts from the flame. Rus

neighbor came over - problemed solved.